| # -*- coding: utf-8 -*- | |
| # There are tests here with unicode string literals and | |
| # identifiers. There's a code in ast.c that was added because of a | |
| # failure with a non-ascii-only expression. So, I have tests for | |
| # that. There are workarounds that would let me run tests for that | |
| # code without unicode identifiers and strings, but just using them | |
| # directly seems like the easiest and therefore safest thing to do. | |
| # Unicode identifiers in tests is allowed by PEP 3131. | |
| import ast | |
| import os | |
| import re | |
| import types | |
| import decimal | |
| import unittest | |
| from test.support.os_helper import temp_cwd | |
| from test.support.script_helper import assert_python_failure | |
| a_global = 'global variable' | |
| # You could argue that I'm too strict in looking for specific error | |
| # values with assertRaisesRegex, but without it it's way too easy to | |
| # make a syntax error in the test strings. Especially with all of the | |
| # triple quotes, raw strings, backslashes, etc. I think it's a | |
| # worthwhile tradeoff. When I switched to this method, I found many | |
| # examples where I wasn't testing what I thought I was. | |
| class TestCase(unittest.TestCase): | |
| def assertAllRaise(self, exception_type, regex, error_strings): | |
| for str in error_strings: | |
| with self.subTest(str=str): | |
| with self.assertRaisesRegex(exception_type, regex): | |
| eval(str) | |
| def test__format__lookup(self): | |
| # Make sure __format__ is looked up on the type, not the instance. | |
| class X: | |
| def __format__(self, spec): | |
| return 'class' | |
| x = X() | |
| # Add a bound __format__ method to the 'y' instance, but not | |
| # the 'x' instance. | |
| y = X() | |
| y.__format__ = types.MethodType(lambda self, spec: 'instance', y) | |
| self.assertEqual(f'{y}', format(y)) | |
| self.assertEqual(f'{y}', 'class') | |
| self.assertEqual(format(x), format(y)) | |
| # __format__ is not called this way, but still make sure it | |
| # returns what we expect (so we can make sure we're bypassing | |
| # it). | |
| self.assertEqual(x.__format__(''), 'class') | |
| self.assertEqual(y.__format__(''), 'instance') | |
| # This is how __format__ is actually called. | |
| self.assertEqual(type(x).__format__(x, ''), 'class') | |
| self.assertEqual(type(y).__format__(y, ''), 'class') | |
| def test_ast(self): | |
| # Inspired by http://bugs.python.org/issue24975 | |
| class X: | |
| def __init__(self): | |
| self.called = False | |
| def __call__(self): | |
| self.called = True | |
| return 4 | |
| x = X() | |
| expr = """ | |
| a = 10 | |
| f'{a * x()}'""" | |
| t = ast.parse(expr) | |
| c = compile(t, '', 'exec') | |
| # Make sure x was not called. | |
| self.assertFalse(x.called) | |
| # Actually run the code. | |
| exec(c) | |
| # Make sure x was called. | |
| self.assertTrue(x.called) | |
| def test_ast_line_numbers(self): | |
| expr = """ | |
| a = 10 | |
| f'{a * x()}'""" | |
| t = ast.parse(expr) | |
| self.assertEqual(type(t), ast.Module) | |
| self.assertEqual(len(t.body), 2) | |
| # check `a = 10` | |
| self.assertEqual(type(t.body[0]), ast.Assign) | |
| self.assertEqual(t.body[0].lineno, 2) | |
| # check `f'...'` | |
| self.assertEqual(type(t.body[1]), ast.Expr) | |
| self.assertEqual(type(t.body[1].value), ast.JoinedStr) | |
| self.assertEqual(len(t.body[1].value.values), 1) | |
| self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue) | |
| self.assertEqual(t.body[1].lineno, 3) | |
| self.assertEqual(t.body[1].value.lineno, 3) | |
| self.assertEqual(t.body[1].value.values[0].lineno, 3) | |
| # check the binop location | |
| binop = t.body[1].value.values[0].value | |
| self.assertEqual(type(binop), ast.BinOp) | |
| self.assertEqual(type(binop.left), ast.Name) | |
| self.assertEqual(type(binop.op), ast.Mult) | |
| self.assertEqual(type(binop.right), ast.Call) | |
| self.assertEqual(binop.lineno, 3) | |
| self.assertEqual(binop.left.lineno, 3) | |
| self.assertEqual(binop.right.lineno, 3) | |
| self.assertEqual(binop.col_offset, 3) | |
| self.assertEqual(binop.left.col_offset, 3) | |
| self.assertEqual(binop.right.col_offset, 7) | |
| def test_ast_line_numbers_multiple_formattedvalues(self): | |
| expr = """ | |
| f'no formatted values' | |
| f'eggs {a * x()} spam {b + y()}'""" | |
| t = ast.parse(expr) | |
| self.assertEqual(type(t), ast.Module) | |
| self.assertEqual(len(t.body), 2) | |
| # check `f'no formatted value'` | |
| self.assertEqual(type(t.body[0]), ast.Expr) | |
| self.assertEqual(type(t.body[0].value), ast.JoinedStr) | |
| self.assertEqual(t.body[0].lineno, 2) | |
| # check `f'...'` | |
| self.assertEqual(type(t.body[1]), ast.Expr) | |
| self.assertEqual(type(t.body[1].value), ast.JoinedStr) | |
| self.assertEqual(len(t.body[1].value.values), 4) | |
| self.assertEqual(type(t.body[1].value.values[0]), ast.Constant) | |
| self.assertEqual(type(t.body[1].value.values[0].value), str) | |
| self.assertEqual(type(t.body[1].value.values[1]), ast.FormattedValue) | |
| self.assertEqual(type(t.body[1].value.values[2]), ast.Constant) | |
| self.assertEqual(type(t.body[1].value.values[2].value), str) | |
| self.assertEqual(type(t.body[1].value.values[3]), ast.FormattedValue) | |
| self.assertEqual(t.body[1].lineno, 3) | |
| self.assertEqual(t.body[1].value.lineno, 3) | |
| self.assertEqual(t.body[1].value.values[0].lineno, 3) | |
| self.assertEqual(t.body[1].value.values[1].lineno, 3) | |
| self.assertEqual(t.body[1].value.values[2].lineno, 3) | |
| self.assertEqual(t.body[1].value.values[3].lineno, 3) | |
| # check the first binop location | |
| binop1 = t.body[1].value.values[1].value | |
| self.assertEqual(type(binop1), ast.BinOp) | |
| self.assertEqual(type(binop1.left), ast.Name) | |
| self.assertEqual(type(binop1.op), ast.Mult) | |
| self.assertEqual(type(binop1.right), ast.Call) | |
| self.assertEqual(binop1.lineno, 3) | |
| self.assertEqual(binop1.left.lineno, 3) | |
| self.assertEqual(binop1.right.lineno, 3) | |
| self.assertEqual(binop1.col_offset, 8) | |
| self.assertEqual(binop1.left.col_offset, 8) | |
| self.assertEqual(binop1.right.col_offset, 12) | |
| # check the second binop location | |
| binop2 = t.body[1].value.values[3].value | |
| self.assertEqual(type(binop2), ast.BinOp) | |
| self.assertEqual(type(binop2.left), ast.Name) | |
| self.assertEqual(type(binop2.op), ast.Add) | |
| self.assertEqual(type(binop2.right), ast.Call) | |
| self.assertEqual(binop2.lineno, 3) | |
| self.assertEqual(binop2.left.lineno, 3) | |
| self.assertEqual(binop2.right.lineno, 3) | |
| self.assertEqual(binop2.col_offset, 23) | |
| self.assertEqual(binop2.left.col_offset, 23) | |
| self.assertEqual(binop2.right.col_offset, 27) | |
| def test_ast_line_numbers_nested(self): | |
| expr = """ | |
| a = 10 | |
| f'{a * f"-{x()}-"}'""" | |
| t = ast.parse(expr) | |
| self.assertEqual(type(t), ast.Module) | |
| self.assertEqual(len(t.body), 2) | |
| # check `a = 10` | |
| self.assertEqual(type(t.body[0]), ast.Assign) | |
| self.assertEqual(t.body[0].lineno, 2) | |
| # check `f'...'` | |
| self.assertEqual(type(t.body[1]), ast.Expr) | |
| self.assertEqual(type(t.body[1].value), ast.JoinedStr) | |
| self.assertEqual(len(t.body[1].value.values), 1) | |
| self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue) | |
| self.assertEqual(t.body[1].lineno, 3) | |
| self.assertEqual(t.body[1].value.lineno, 3) | |
| self.assertEqual(t.body[1].value.values[0].lineno, 3) | |
| # check the binop location | |
| binop = t.body[1].value.values[0].value | |
| self.assertEqual(type(binop), ast.BinOp) | |
| self.assertEqual(type(binop.left), ast.Name) | |
| self.assertEqual(type(binop.op), ast.Mult) | |
| self.assertEqual(type(binop.right), ast.JoinedStr) | |
| self.assertEqual(binop.lineno, 3) | |
| self.assertEqual(binop.left.lineno, 3) | |
| self.assertEqual(binop.right.lineno, 3) | |
| self.assertEqual(binop.col_offset, 3) | |
| self.assertEqual(binop.left.col_offset, 3) | |
| self.assertEqual(binop.right.col_offset, 7) | |
| # check the nested call location | |
| self.assertEqual(len(binop.right.values), 3) | |
| self.assertEqual(type(binop.right.values[0]), ast.Constant) | |
| self.assertEqual(type(binop.right.values[0].value), str) | |
| self.assertEqual(type(binop.right.values[1]), ast.FormattedValue) | |
| self.assertEqual(type(binop.right.values[2]), ast.Constant) | |
| self.assertEqual(type(binop.right.values[2].value), str) | |
| self.assertEqual(binop.right.values[0].lineno, 3) | |
| self.assertEqual(binop.right.values[1].lineno, 3) | |
| self.assertEqual(binop.right.values[2].lineno, 3) | |
| call = binop.right.values[1].value | |
| self.assertEqual(type(call), ast.Call) | |
| self.assertEqual(call.lineno, 3) | |
| self.assertEqual(call.col_offset, 11) | |
| def test_ast_line_numbers_duplicate_expression(self): | |
| expr = """ | |
| a = 10 | |
| f'{a * x()} {a * x()} {a * x()}' | |
| """ | |
| t = ast.parse(expr) | |
| self.assertEqual(type(t), ast.Module) | |
| self.assertEqual(len(t.body), 2) | |
| # check `a = 10` | |
| self.assertEqual(type(t.body[0]), ast.Assign) | |
| self.assertEqual(t.body[0].lineno, 2) | |
| # check `f'...'` | |
| self.assertEqual(type(t.body[1]), ast.Expr) | |
| self.assertEqual(type(t.body[1].value), ast.JoinedStr) | |
| self.assertEqual(len(t.body[1].value.values), 5) | |
| self.assertEqual(type(t.body[1].value.values[0]), ast.FormattedValue) | |
| self.assertEqual(type(t.body[1].value.values[1]), ast.Constant) | |
| self.assertEqual(type(t.body[1].value.values[1].value), str) | |
| self.assertEqual(type(t.body[1].value.values[2]), ast.FormattedValue) | |
| self.assertEqual(type(t.body[1].value.values[3]), ast.Constant) | |
| self.assertEqual(type(t.body[1].value.values[3].value), str) | |
| self.assertEqual(type(t.body[1].value.values[4]), ast.FormattedValue) | |
| self.assertEqual(t.body[1].lineno, 3) | |
| self.assertEqual(t.body[1].value.lineno, 3) | |
| self.assertEqual(t.body[1].value.values[0].lineno, 3) | |
| self.assertEqual(t.body[1].value.values[1].lineno, 3) | |
| self.assertEqual(t.body[1].value.values[2].lineno, 3) | |
| self.assertEqual(t.body[1].value.values[3].lineno, 3) | |
| self.assertEqual(t.body[1].value.values[4].lineno, 3) | |
| # check the first binop location | |
| binop = t.body[1].value.values[0].value | |
| self.assertEqual(type(binop), ast.BinOp) | |
| self.assertEqual(type(binop.left), ast.Name) | |
| self.assertEqual(type(binop.op), ast.Mult) | |
| self.assertEqual(type(binop.right), ast.Call) | |
| self.assertEqual(binop.lineno, 3) | |
| self.assertEqual(binop.left.lineno, 3) | |
| self.assertEqual(binop.right.lineno, 3) | |
| self.assertEqual(binop.col_offset, 3) | |
| self.assertEqual(binop.left.col_offset, 3) | |
| self.assertEqual(binop.right.col_offset, 7) | |
| # check the second binop location | |
| binop = t.body[1].value.values[2].value | |
| self.assertEqual(type(binop), ast.BinOp) | |
| self.assertEqual(type(binop.left), ast.Name) | |
| self.assertEqual(type(binop.op), ast.Mult) | |
| self.assertEqual(type(binop.right), ast.Call) | |
| self.assertEqual(binop.lineno, 3) | |
| self.assertEqual(binop.left.lineno, 3) | |
| self.assertEqual(binop.right.lineno, 3) | |
| self.assertEqual(binop.col_offset, 13) | |
| self.assertEqual(binop.left.col_offset, 13) | |
| self.assertEqual(binop.right.col_offset, 17) | |
| # check the third binop location | |
| binop = t.body[1].value.values[4].value | |
| self.assertEqual(type(binop), ast.BinOp) | |
| self.assertEqual(type(binop.left), ast.Name) | |
| self.assertEqual(type(binop.op), ast.Mult) | |
| self.assertEqual(type(binop.right), ast.Call) | |
| self.assertEqual(binop.lineno, 3) | |
| self.assertEqual(binop.left.lineno, 3) | |
| self.assertEqual(binop.right.lineno, 3) | |
| self.assertEqual(binop.col_offset, 23) | |
| self.assertEqual(binop.left.col_offset, 23) | |
| self.assertEqual(binop.right.col_offset, 27) | |
| def test_ast_numbers_fstring_with_formatting(self): | |
| t = ast.parse('f"Here is that pesky {xxx:.3f} again"') | |
| self.assertEqual(len(t.body), 1) | |
| self.assertEqual(t.body[0].lineno, 1) | |
| self.assertEqual(type(t.body[0]), ast.Expr) | |
| self.assertEqual(type(t.body[0].value), ast.JoinedStr) | |
| self.assertEqual(len(t.body[0].value.values), 3) | |
| self.assertEqual(type(t.body[0].value.values[0]), ast.Constant) | |
| self.assertEqual(type(t.body[0].value.values[1]), ast.FormattedValue) | |
| self.assertEqual(type(t.body[0].value.values[2]), ast.Constant) | |
| _, expr, _ = t.body[0].value.values | |
| name = expr.value | |
| self.assertEqual(type(name), ast.Name) | |
| self.assertEqual(name.lineno, 1) | |
| self.assertEqual(name.end_lineno, 1) | |
| self.assertEqual(name.col_offset, 22) | |
| self.assertEqual(name.end_col_offset, 25) | |
| def test_ast_line_numbers_multiline_fstring(self): | |
| # See bpo-30465 for details. | |
| expr = """ | |
| a = 10 | |
| f''' | |
| {a | |
| * | |
| x()} | |
| non-important content | |
| ''' | |
| """ | |
| t = ast.parse(expr) | |
| self.assertEqual(type(t), ast.Module) | |
| self.assertEqual(len(t.body), 2) | |
| # check `a = 10` | |
| self.assertEqual(type(t.body[0]), ast.Assign) | |
| self.assertEqual(t.body[0].lineno, 2) | |
| # check `f'...'` | |
| self.assertEqual(type(t.body[1]), ast.Expr) | |
| self.assertEqual(type(t.body[1].value), ast.JoinedStr) | |
| self.assertEqual(len(t.body[1].value.values), 3) | |
| self.assertEqual(type(t.body[1].value.values[0]), ast.Constant) | |
| self.assertEqual(type(t.body[1].value.values[0].value), str) | |
| self.assertEqual(type(t.body[1].value.values[1]), ast.FormattedValue) | |
| self.assertEqual(type(t.body[1].value.values[2]), ast.Constant) | |
| self.assertEqual(type(t.body[1].value.values[2].value), str) | |
| self.assertEqual(t.body[1].lineno, 3) | |
| self.assertEqual(t.body[1].value.lineno, 3) | |
| self.assertEqual(t.body[1].value.values[0].lineno, 3) | |
| self.assertEqual(t.body[1].value.values[1].lineno, 3) | |
| self.assertEqual(t.body[1].value.values[2].lineno, 3) | |
| self.assertEqual(t.body[1].col_offset, 0) | |
| self.assertEqual(t.body[1].value.col_offset, 0) | |
| self.assertEqual(t.body[1].value.values[0].col_offset, 0) | |
| self.assertEqual(t.body[1].value.values[1].col_offset, 0) | |
| self.assertEqual(t.body[1].value.values[2].col_offset, 0) | |
| # NOTE: the following lineno information and col_offset is correct for | |
| # expressions within FormattedValues. | |
| binop = t.body[1].value.values[1].value | |
| self.assertEqual(type(binop), ast.BinOp) | |
| self.assertEqual(type(binop.left), ast.Name) | |
| self.assertEqual(type(binop.op), ast.Mult) | |
| self.assertEqual(type(binop.right), ast.Call) | |
| self.assertEqual(binop.lineno, 4) | |
| self.assertEqual(binop.left.lineno, 4) | |
| self.assertEqual(binop.right.lineno, 6) | |
| self.assertEqual(binop.col_offset, 4) | |
| self.assertEqual(binop.left.col_offset, 4) | |
| self.assertEqual(binop.right.col_offset, 7) | |
| def test_ast_line_numbers_with_parentheses(self): | |
| expr = """ | |
| x = ( | |
| f" {test(t)}" | |
| )""" | |
| t = ast.parse(expr) | |
| self.assertEqual(type(t), ast.Module) | |
| self.assertEqual(len(t.body), 1) | |
| # check the test(t) location | |
| call = t.body[0].value.values[1].value | |
| self.assertEqual(type(call), ast.Call) | |
| self.assertEqual(call.lineno, 3) | |
| self.assertEqual(call.end_lineno, 3) | |
| self.assertEqual(call.col_offset, 8) | |
| self.assertEqual(call.end_col_offset, 15) | |
| expr = """ | |
| x = ( | |
| 'PERL_MM_OPT', ( | |
| f'wat' | |
| f'some_string={f(x)} ' | |
| f'wat' | |
| ), | |
| ) | |
| """ | |
| t = ast.parse(expr) | |
| self.assertEqual(type(t), ast.Module) | |
| self.assertEqual(len(t.body), 1) | |
| # check the fstring | |
| fstring = t.body[0].value.elts[1] | |
| self.assertEqual(type(fstring), ast.JoinedStr) | |
| self.assertEqual(len(fstring.values), 3) | |
| wat1, middle, wat2 = fstring.values | |
| # check the first wat | |
| self.assertEqual(type(wat1), ast.Constant) | |
| self.assertEqual(wat1.lineno, 4) | |
| self.assertEqual(wat1.end_lineno, 6) | |
| self.assertEqual(wat1.col_offset, 12) | |
| self.assertEqual(wat1.end_col_offset, 18) | |
| # check the call | |
| call = middle.value | |
| self.assertEqual(type(call), ast.Call) | |
| self.assertEqual(call.lineno, 5) | |
| self.assertEqual(call.end_lineno, 5) | |
| self.assertEqual(call.col_offset, 27) | |
| self.assertEqual(call.end_col_offset, 31) | |
| # check the second wat | |
| self.assertEqual(type(wat2), ast.Constant) | |
| self.assertEqual(wat2.lineno, 4) | |
| self.assertEqual(wat2.end_lineno, 6) | |
| self.assertEqual(wat2.col_offset, 12) | |
| self.assertEqual(wat2.end_col_offset, 18) | |
| def test_docstring(self): | |
| def f(): | |
| f'''Not a docstring''' | |
| self.assertIsNone(f.__doc__) | |
| def g(): | |
| '''Not a docstring''' \ | |
| f'' | |
| self.assertIsNone(g.__doc__) | |
| def test_literal_eval(self): | |
| with self.assertRaisesRegex(ValueError, 'malformed node or string'): | |
| ast.literal_eval("f'x'") | |
| def test_ast_compile_time_concat(self): | |
| x = [''] | |
| expr = """x[0] = 'foo' f'{3}'""" | |
| t = ast.parse(expr) | |
| c = compile(t, '', 'exec') | |
| exec(c) | |
| self.assertEqual(x[0], 'foo3') | |
| def test_compile_time_concat_errors(self): | |
| self.assertAllRaise(SyntaxError, | |
| 'cannot mix bytes and nonbytes literals', | |
| [r"""f'' b''""", | |
| r"""b'' f''""", | |
| ]) | |
| def test_literal(self): | |
| self.assertEqual(f'', '') | |
| self.assertEqual(f'a', 'a') | |
| self.assertEqual(f' ', ' ') | |
| def test_unterminated_string(self): | |
| self.assertAllRaise(SyntaxError, 'f-string: unterminated string', | |
| [r"""f'{"x'""", | |
| r"""f'{"x}'""", | |
| r"""f'{("x'""", | |
| r"""f'{("x}'""", | |
| ]) | |
| def test_mismatched_parens(self): | |
| self.assertAllRaise(SyntaxError, r"f-string: closing parenthesis '\}' " | |
| r"does not match opening parenthesis '\('", | |
| ["f'{((}'", | |
| ]) | |
| self.assertAllRaise(SyntaxError, r"f-string: closing parenthesis '\)' " | |
| r"does not match opening parenthesis '\['", | |
| ["f'{a[4)}'", | |
| ]) | |
| self.assertAllRaise(SyntaxError, r"f-string: closing parenthesis '\]' " | |
| r"does not match opening parenthesis '\('", | |
| ["f'{a(4]}'", | |
| ]) | |
| self.assertAllRaise(SyntaxError, r"f-string: closing parenthesis '\}' " | |
| r"does not match opening parenthesis '\['", | |
| ["f'{a[4}'", | |
| ]) | |
| self.assertAllRaise(SyntaxError, r"f-string: closing parenthesis '\}' " | |
| r"does not match opening parenthesis '\('", | |
| ["f'{a(4}'", | |
| ]) | |
| self.assertRaises(SyntaxError, eval, "f'{" + "("*500 + "}'") | |
| def test_double_braces(self): | |
| self.assertEqual(f'{{', '{') | |
| self.assertEqual(f'a{{', 'a{') | |
| self.assertEqual(f'{{b', '{b') | |
| self.assertEqual(f'a{{b', 'a{b') | |
| self.assertEqual(f'}}', '}') | |
| self.assertEqual(f'a}}', 'a}') | |
| self.assertEqual(f'}}b', '}b') | |
| self.assertEqual(f'a}}b', 'a}b') | |
| self.assertEqual(f'{{}}', '{}') | |
| self.assertEqual(f'a{{}}', 'a{}') | |
| self.assertEqual(f'{{b}}', '{b}') | |
| self.assertEqual(f'{{}}c', '{}c') | |
| self.assertEqual(f'a{{b}}', 'a{b}') | |
| self.assertEqual(f'a{{}}c', 'a{}c') | |
| self.assertEqual(f'{{b}}c', '{b}c') | |
| self.assertEqual(f'a{{b}}c', 'a{b}c') | |
| self.assertEqual(f'{{{10}', '{10') | |
| self.assertEqual(f'}}{10}', '}10') | |
| self.assertEqual(f'}}{{{10}', '}{10') | |
| self.assertEqual(f'}}a{{{10}', '}a{10') | |
| self.assertEqual(f'{10}{{', '10{') | |
| self.assertEqual(f'{10}}}', '10}') | |
| self.assertEqual(f'{10}}}{{', '10}{') | |
| self.assertEqual(f'{10}}}a{{' '}', '10}a{}') | |
| # Inside of strings, don't interpret doubled brackets. | |
| self.assertEqual(f'{"{{}}"}', '{{}}') | |
| self.assertAllRaise(TypeError, 'unhashable type', | |
| ["f'{ {{}} }'", # dict in a set | |
| ]) | |
| def test_compile_time_concat(self): | |
| x = 'def' | |
| self.assertEqual('abc' f'## {x}ghi', 'abc## defghi') | |
| self.assertEqual('abc' f'{x}' 'ghi', 'abcdefghi') | |
| self.assertEqual('abc' f'{x}' 'gh' f'i{x:4}', 'abcdefghidef ') | |
| self.assertEqual('{x}' f'{x}', '{x}def') | |
| self.assertEqual('{x' f'{x}', '{xdef') | |
| self.assertEqual('{x}' f'{x}', '{x}def') | |
| self.assertEqual('{{x}}' f'{x}', '{{x}}def') | |
| self.assertEqual('{{x' f'{x}', '{{xdef') | |
| self.assertEqual('x}}' f'{x}', 'x}}def') | |
| self.assertEqual(f'{x}' 'x}}', 'defx}}') | |
| self.assertEqual(f'{x}' '', 'def') | |
| self.assertEqual('' f'{x}' '', 'def') | |
| self.assertEqual('' f'{x}', 'def') | |
| self.assertEqual(f'{x}' '2', 'def2') | |
| self.assertEqual('1' f'{x}' '2', '1def2') | |
| self.assertEqual('1' f'{x}', '1def') | |
| self.assertEqual(f'{x}' f'-{x}', 'def-def') | |
| self.assertEqual('' f'', '') | |
| self.assertEqual('' f'' '', '') | |
| self.assertEqual('' f'' '' f'', '') | |
| self.assertEqual(f'', '') | |
| self.assertEqual(f'' '', '') | |
| self.assertEqual(f'' '' f'', '') | |
| self.assertEqual(f'' '' f'' '', '') | |
| self.assertAllRaise(SyntaxError, "f-string: expecting '}'", | |
| ["f'{3' f'}'", # can't concat to get a valid f-string | |
| ]) | |
| def test_comments(self): | |
| # These aren't comments, since they're in strings. | |
| d = {'#': 'hash'} | |
| self.assertEqual(f'{"#"}', '#') | |
| self.assertEqual(f'{d["#"]}', 'hash') | |
| self.assertAllRaise(SyntaxError, "f-string expression part cannot include '#'", | |
| ["f'{1#}'", # error because the expression becomes "(1#)" | |
| "f'{3(#)}'", | |
| "f'{#}'", | |
| ]) | |
| self.assertAllRaise(SyntaxError, r"f-string: unmatched '\)'", | |
| ["f'{)#}'", # When wrapped in parens, this becomes | |
| # '()#)'. Make sure that doesn't compile. | |
| ]) | |
| def test_many_expressions(self): | |
| # Create a string with many expressions in it. Note that | |
| # because we have a space in here as a literal, we're actually | |
| # going to use twice as many ast nodes: one for each literal | |
| # plus one for each expression. | |
| def build_fstr(n, extra=''): | |
| return "f'" + ('{x} ' * n) + extra + "'" | |
| x = 'X' | |
| width = 1 | |
| # Test around 256. | |
| for i in range(250, 260): | |
| self.assertEqual(eval(build_fstr(i)), (x+' ')*i) | |
| # Test concatenating 2 largs fstrings. | |
| self.assertEqual(eval(build_fstr(255)*256), (x+' ')*(255*256)) | |
| s = build_fstr(253, '{x:{width}} ') | |
| self.assertEqual(eval(s), (x+' ')*254) | |
| # Test lots of expressions and constants, concatenated. | |
| s = "f'{1}' 'x' 'y'" * 1024 | |
| self.assertEqual(eval(s), '1xy' * 1024) | |
| def test_format_specifier_expressions(self): | |
| width = 10 | |
| precision = 4 | |
| value = decimal.Decimal('12.34567') | |
| self.assertEqual(f'result: {value:{width}.{precision}}', 'result: 12.35') | |
| self.assertEqual(f'result: {value:{width!r}.{precision}}', 'result: 12.35') | |
| self.assertEqual(f'result: {value:{width:0}.{precision:1}}', 'result: 12.35') | |
| self.assertEqual(f'result: {value:{1}{0:0}.{precision:1}}', 'result: 12.35') | |
| self.assertEqual(f'result: {value:{ 1}{ 0:0}.{ precision:1}}', 'result: 12.35') | |
| self.assertEqual(f'{10:#{1}0x}', ' 0xa') | |
| self.assertEqual(f'{10:{"#"}1{0}{"x"}}', ' 0xa') | |
| self.assertEqual(f'{-10:-{"#"}1{0}x}', ' -0xa') | |
| self.assertEqual(f'{-10:{"-"}#{1}0{"x"}}', ' -0xa') | |
| self.assertEqual(f'{10:#{3 != {4:5} and width}x}', ' 0xa') | |
| self.assertAllRaise(SyntaxError, "f-string: expecting '}'", | |
| ["""f'{"s"!r{":10"}}'""", | |
| # This looks like a nested format spec. | |
| ]) | |
| self.assertAllRaise(SyntaxError, "f-string: invalid syntax", | |
| [# Invalid syntax inside a nested spec. | |
| "f'{4:{/5}}'", | |
| ]) | |
| self.assertAllRaise(SyntaxError, "f-string: expressions nested too deeply", | |
| [# Can't nest format specifiers. | |
| "f'result: {value:{width:{0}}.{precision:1}}'", | |
| ]) | |
| self.assertAllRaise(SyntaxError, 'f-string: invalid conversion character', | |
| [# No expansion inside conversion or for | |
| # the : or ! itself. | |
| """f'{"s"!{"r"}}'""", | |
| ]) | |
| def test_side_effect_order(self): | |
| class X: | |
| def __init__(self): | |
| self.i = 0 | |
| def __format__(self, spec): | |
| self.i += 1 | |
| return str(self.i) | |
| x = X() | |
| self.assertEqual(f'{x} {x}', '1 2') | |
| def test_missing_expression(self): | |
| self.assertAllRaise(SyntaxError, 'f-string: empty expression not allowed', | |
| ["f'{}'", | |
| "f'{ }'" | |
| "f' {} '", | |
| "f'{!r}'", | |
| "f'{ !r}'", | |
| "f'{10:{ }}'", | |
| "f' { } '", | |
| # The Python parser ignores also the following | |
| # whitespace characters in additional to a space. | |
| "f'''{\t\f\r\n}'''", | |
| # Catch the empty expression before the | |
| # invalid conversion. | |
| "f'{!x}'", | |
| "f'{ !xr}'", | |
| "f'{!x:}'", | |
| "f'{!x:a}'", | |
| "f'{ !xr:}'", | |
| "f'{ !xr:a}'", | |
| "f'{!}'", | |
| "f'{:}'", | |
| # We find the empty expression before the | |
| # missing closing brace. | |
| "f'{!'", | |
| "f'{!s:'", | |
| "f'{:'", | |
| "f'{:x'", | |
| ]) | |
| # Different error message is raised for other whitespace characters. | |
| self.assertAllRaise(SyntaxError, r"invalid non-printable character U\+00A0", | |
| ["f'''{\xa0}'''", | |
| "\xa0", | |
| ]) | |
| def test_parens_in_expressions(self): | |
| self.assertEqual(f'{3,}', '(3,)') | |
| # Add these because when an expression is evaluated, parens | |
| # are added around it. But we shouldn't go from an invalid | |
| # expression to a valid one. The added parens are just | |
| # supposed to allow whitespace (including newlines). | |
| self.assertAllRaise(SyntaxError, 'f-string: invalid syntax', | |
| ["f'{,}'", | |
| "f'{,}'", # this is (,), which is an error | |
| ]) | |
| self.assertAllRaise(SyntaxError, r"f-string: unmatched '\)'", | |
| ["f'{3)+(4}'", | |
| ]) | |
| self.assertAllRaise(SyntaxError, 'unterminated string literal', | |
| ["f'{\n}'", | |
| ]) | |
| def test_newlines_before_syntax_error(self): | |
| self.assertAllRaise(SyntaxError, "invalid syntax", | |
| ["f'{.}'", "\nf'{.}'", "\n\nf'{.}'"]) | |
| def test_backslashes_in_string_part(self): | |
| self.assertEqual(f'\t', '\t') | |
| self.assertEqual(r'\t', '\\t') | |
| self.assertEqual(rf'\t', '\\t') | |
| self.assertEqual(f'{2}\t', '2\t') | |
| self.assertEqual(f'{2}\t{3}', '2\t3') | |
| self.assertEqual(f'\t{3}', '\t3') | |
| self.assertEqual(f'\u0394', '\u0394') | |
| self.assertEqual(r'\u0394', '\\u0394') | |
| self.assertEqual(rf'\u0394', '\\u0394') | |
| self.assertEqual(f'{2}\u0394', '2\u0394') | |
| self.assertEqual(f'{2}\u0394{3}', '2\u03943') | |
| self.assertEqual(f'\u0394{3}', '\u03943') | |
| self.assertEqual(f'\U00000394', '\u0394') | |
| self.assertEqual(r'\U00000394', '\\U00000394') | |
| self.assertEqual(rf'\U00000394', '\\U00000394') | |
| self.assertEqual(f'{2}\U00000394', '2\u0394') | |
| self.assertEqual(f'{2}\U00000394{3}', '2\u03943') | |
| self.assertEqual(f'\U00000394{3}', '\u03943') | |
| self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}', '\u0394') | |
| self.assertEqual(f'{2}\N{GREEK CAPITAL LETTER DELTA}', '2\u0394') | |
| self.assertEqual(f'{2}\N{GREEK CAPITAL LETTER DELTA}{3}', '2\u03943') | |
| self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}{3}', '\u03943') | |
| self.assertEqual(f'2\N{GREEK CAPITAL LETTER DELTA}', '2\u0394') | |
| self.assertEqual(f'2\N{GREEK CAPITAL LETTER DELTA}3', '2\u03943') | |
| self.assertEqual(f'\N{GREEK CAPITAL LETTER DELTA}3', '\u03943') | |
| self.assertEqual(f'\x20', ' ') | |
| self.assertEqual(r'\x20', '\\x20') | |
| self.assertEqual(rf'\x20', '\\x20') | |
| self.assertEqual(f'{2}\x20', '2 ') | |
| self.assertEqual(f'{2}\x20{3}', '2 3') | |
| self.assertEqual(f'\x20{3}', ' 3') | |
| self.assertEqual(f'2\x20', '2 ') | |
| self.assertEqual(f'2\x203', '2 3') | |
| self.assertEqual(f'\x203', ' 3') | |
| with self.assertWarns(DeprecationWarning): # invalid escape sequence | |
| value = eval(r"f'\{6*7}'") | |
| self.assertEqual(value, '\\42') | |
| self.assertEqual(f'\\{6*7}', '\\42') | |
| self.assertEqual(fr'\{6*7}', '\\42') | |
| AMPERSAND = 'spam' | |
| # Get the right unicode character (&), or pick up local variable | |
| # depending on the number of backslashes. | |
| self.assertEqual(f'\N{AMPERSAND}', '&') | |
| self.assertEqual(f'\\N{AMPERSAND}', '\\Nspam') | |
| self.assertEqual(fr'\N{AMPERSAND}', '\\Nspam') | |
| self.assertEqual(f'\\\N{AMPERSAND}', '\\&') | |
| def test_misformed_unicode_character_name(self): | |
| # These test are needed because unicode names are parsed | |
| # differently inside f-strings. | |
| self.assertAllRaise(SyntaxError, r"\(unicode error\) 'unicodeescape' codec can't decode bytes in position .*: malformed \\N character escape", | |
| [r"f'\N'", | |
| r"f'\N '", | |
| r"f'\N '", # See bpo-46503. | |
| r"f'\N{'", | |
| r"f'\N{GREEK CAPITAL LETTER DELTA'", | |
| # Here are the non-f-string versions, | |
| # which should give the same errors. | |
| r"'\N'", | |
| r"'\N '", | |
| r"'\N '", | |
| r"'\N{'", | |
| r"'\N{GREEK CAPITAL LETTER DELTA'", | |
| ]) | |
| def test_no_backslashes_in_expression_part(self): | |
| self.assertAllRaise(SyntaxError, 'f-string expression part cannot include a backslash', | |
| [r"f'{\'a\'}'", | |
| r"f'{\t3}'", | |
| r"f'{\}'", | |
| r"rf'{\'a\'}'", | |
| r"rf'{\t3}'", | |
| r"rf'{\}'", | |
| r"""rf'{"\N{LEFT CURLY BRACKET}"}'""", | |
| r"f'{\n}'", | |
| ]) | |
| def test_no_escapes_for_braces(self): | |
| """ | |
| Only literal curly braces begin an expression. | |
| """ | |
| # \x7b is '{'. | |
| self.assertEqual(f'\x7b1+1}}', '{1+1}') | |
| self.assertEqual(f'\x7b1+1', '{1+1') | |
| self.assertEqual(f'\u007b1+1', '{1+1') | |
| self.assertEqual(f'\N{LEFT CURLY BRACKET}1+1\N{RIGHT CURLY BRACKET}', '{1+1}') | |
| def test_newlines_in_expressions(self): | |
| self.assertEqual(f'{0}', '0') | |
| self.assertEqual(rf'''{3+ | |
| 4}''', '7') | |
| def test_lambda(self): | |
| x = 5 | |
| self.assertEqual(f'{(lambda y:x*y)("8")!r}', "'88888'") | |
| self.assertEqual(f'{(lambda y:x*y)("8")!r:10}', "'88888' ") | |
| self.assertEqual(f'{(lambda y:x*y)("8"):10}', "88888 ") | |
| # lambda doesn't work without parens, because the colon | |
| # makes the parser think it's a format_spec | |
| self.assertAllRaise(SyntaxError, 'f-string: invalid syntax', | |
| ["f'{lambda x:x}'", | |
| ]) | |
| def test_yield(self): | |
| # Not terribly useful, but make sure the yield turns | |
| # a function into a generator | |
| def fn(y): | |
| f'y:{yield y*2}' | |
| f'{yield}' | |
| g = fn(4) | |
| self.assertEqual(next(g), 8) | |
| self.assertEqual(next(g), None) | |
| def test_yield_send(self): | |
| def fn(x): | |
| yield f'x:{yield (lambda i: x * i)}' | |
| g = fn(10) | |
| the_lambda = next(g) | |
| self.assertEqual(the_lambda(4), 40) | |
| self.assertEqual(g.send('string'), 'x:string') | |
| def test_expressions_with_triple_quoted_strings(self): | |
| self.assertEqual(f"{'''x'''}", 'x') | |
| self.assertEqual(f"{'''eric's'''}", "eric's") | |
| # Test concatenation within an expression | |
| self.assertEqual(f'{"x" """eric"s""" "y"}', 'xeric"sy') | |
| self.assertEqual(f'{"x" """eric"s"""}', 'xeric"s') | |
| self.assertEqual(f'{"""eric"s""" "y"}', 'eric"sy') | |
| self.assertEqual(f'{"""x""" """eric"s""" "y"}', 'xeric"sy') | |
| self.assertEqual(f'{"""x""" """eric"s""" """y"""}', 'xeric"sy') | |
| self.assertEqual(f'{r"""x""" """eric"s""" """y"""}', 'xeric"sy') | |
| def test_multiple_vars(self): | |
| x = 98 | |
| y = 'abc' | |
| self.assertEqual(f'{x}{y}', '98abc') | |
| self.assertEqual(f'X{x}{y}', 'X98abc') | |
| self.assertEqual(f'{x}X{y}', '98Xabc') | |
| self.assertEqual(f'{x}{y}X', '98abcX') | |
| self.assertEqual(f'X{x}Y{y}', 'X98Yabc') | |
| self.assertEqual(f'X{x}{y}Y', 'X98abcY') | |
| self.assertEqual(f'{x}X{y}Y', '98XabcY') | |
| self.assertEqual(f'X{x}Y{y}Z', 'X98YabcZ') | |
| def test_closure(self): | |
| def outer(x): | |
| def inner(): | |
| return f'x:{x}' | |
| return inner | |
| self.assertEqual(outer('987')(), 'x:987') | |
| self.assertEqual(outer(7)(), 'x:7') | |
| def test_arguments(self): | |
| y = 2 | |
| def f(x, width): | |
| return f'x={x*y:{width}}' | |
| self.assertEqual(f('foo', 10), 'x=foofoo ') | |
| x = 'bar' | |
| self.assertEqual(f(10, 10), 'x= 20') | |
| def test_locals(self): | |
| value = 123 | |
| self.assertEqual(f'v:{value}', 'v:123') | |
| def test_missing_variable(self): | |
| with self.assertRaises(NameError): | |
| f'v:{value}' | |
| def test_missing_format_spec(self): | |
| class O: | |
| def __format__(self, spec): | |
| if not spec: | |
| return '*' | |
| return spec | |
| self.assertEqual(f'{O():x}', 'x') | |
| self.assertEqual(f'{O()}', '*') | |
| self.assertEqual(f'{O():}', '*') | |
| self.assertEqual(f'{3:}', '3') | |
| self.assertEqual(f'{3!s:}', '3') | |
| def test_global(self): | |
| self.assertEqual(f'g:{a_global}', 'g:global variable') | |
| self.assertEqual(f'g:{a_global!r}', "g:'global variable'") | |
| a_local = 'local variable' | |
| self.assertEqual(f'g:{a_global} l:{a_local}', | |
| 'g:global variable l:local variable') | |
| self.assertEqual(f'g:{a_global!r}', | |
| "g:'global variable'") | |
| self.assertEqual(f'g:{a_global} l:{a_local!r}', | |
| "g:global variable l:'local variable'") | |
| self.assertIn("module 'unittest' from", f'{unittest}') | |
| def test_shadowed_global(self): | |
| a_global = 'really a local' | |
| self.assertEqual(f'g:{a_global}', 'g:really a local') | |
| self.assertEqual(f'g:{a_global!r}', "g:'really a local'") | |
| a_local = 'local variable' | |
| self.assertEqual(f'g:{a_global} l:{a_local}', | |
| 'g:really a local l:local variable') | |
| self.assertEqual(f'g:{a_global!r}', | |
| "g:'really a local'") | |
| self.assertEqual(f'g:{a_global} l:{a_local!r}', | |
| "g:really a local l:'local variable'") | |
| def test_call(self): | |
| def foo(x): | |
| return 'x=' + str(x) | |
| self.assertEqual(f'{foo(10)}', 'x=10') | |
| def test_nested_fstrings(self): | |
| y = 5 | |
| self.assertEqual(f'{f"{0}"*3}', '000') | |
| self.assertEqual(f'{f"{y}"*3}', '555') | |
| def test_invalid_string_prefixes(self): | |
| single_quote_cases = ["fu''", | |
| "uf''", | |
| "Fu''", | |
| "fU''", | |
| "Uf''", | |
| "uF''", | |
| "ufr''", | |
| "urf''", | |
| "fur''", | |
| "fru''", | |
| "rfu''", | |
| "ruf''", | |
| "FUR''", | |
| "Fur''", | |
| "fb''", | |
| "fB''", | |
| "Fb''", | |
| "FB''", | |
| "bf''", | |
| "bF''", | |
| "Bf''", | |
| "BF''",] | |
| double_quote_cases = [case.replace("'", '"') for case in single_quote_cases] | |
| self.assertAllRaise(SyntaxError, 'invalid syntax', | |
| single_quote_cases + double_quote_cases) | |
| def test_leading_trailing_spaces(self): | |
| self.assertEqual(f'{ 3}', '3') | |
| self.assertEqual(f'{ 3}', '3') | |
| self.assertEqual(f'{3 }', '3') | |
| self.assertEqual(f'{3 }', '3') | |
| self.assertEqual(f'expr={ {x: y for x, y in [(1, 2), ]}}', | |
| 'expr={1: 2}') | |
| self.assertEqual(f'expr={ {x: y for x, y in [(1, 2), ]} }', | |
| 'expr={1: 2}') | |
| def test_not_equal(self): | |
| # There's a special test for this because there's a special | |
| # case in the f-string parser to look for != as not ending an | |
| # expression. Normally it would, while looking for !s or !r. | |
| self.assertEqual(f'{3!=4}', 'True') | |
| self.assertEqual(f'{3!=4:}', 'True') | |
| self.assertEqual(f'{3!=4!s}', 'True') | |
| self.assertEqual(f'{3!=4!s:.3}', 'Tru') | |
| def test_equal_equal(self): | |
| # Because an expression ending in = has special meaning, | |
| # there's a special test for ==. Make sure it works. | |
| self.assertEqual(f'{0==1}', 'False') | |
| def test_conversions(self): | |
| self.assertEqual(f'{3.14:10.10}', ' 3.14') | |
| self.assertEqual(f'{3.14!s:10.10}', '3.14 ') | |
| self.assertEqual(f'{3.14!r:10.10}', '3.14 ') | |
| self.assertEqual(f'{3.14!a:10.10}', '3.14 ') | |
| self.assertEqual(f'{"a"}', 'a') | |
| self.assertEqual(f'{"a"!r}', "'a'") | |
| self.assertEqual(f'{"a"!a}', "'a'") | |
| # Not a conversion. | |
| self.assertEqual(f'{"a!r"}', "a!r") | |
| # Not a conversion, but show that ! is allowed in a format spec. | |
| self.assertEqual(f'{3.14:!<10.10}', '3.14!!!!!!') | |
| self.assertAllRaise(SyntaxError, 'f-string: invalid conversion character', | |
| ["f'{3!g}'", | |
| "f'{3!A}'", | |
| "f'{3!3}'", | |
| "f'{3!G}'", | |
| "f'{3!!}'", | |
| "f'{3!:}'", | |
| "f'{3! s}'", # no space before conversion char | |
| ]) | |
| self.assertAllRaise(SyntaxError, "f-string: expecting '}'", | |
| ["f'{x!s{y}}'", | |
| "f'{3!ss}'", | |
| "f'{3!ss:}'", | |
| "f'{3!ss:s}'", | |
| ]) | |
| def test_assignment(self): | |
| self.assertAllRaise(SyntaxError, r'invalid syntax', | |
| ["f'' = 3", | |
| "f'{0}' = x", | |
| "f'{x}' = x", | |
| ]) | |
| def test_del(self): | |
| self.assertAllRaise(SyntaxError, 'invalid syntax', | |
| ["del f''", | |
| "del '' f''", | |
| ]) | |
| def test_mismatched_braces(self): | |
| self.assertAllRaise(SyntaxError, "f-string: single '}' is not allowed", | |
| ["f'{{}'", | |
| "f'{{}}}'", | |
| "f'}'", | |
| "f'x}'", | |
| "f'x}x'", | |
| r"f'\u007b}'", | |
| # Can't have { or } in a format spec. | |
| "f'{3:}>10}'", | |
| "f'{3:}}>10}'", | |
| ]) | |
| self.assertAllRaise(SyntaxError, "f-string: expecting '}'", | |
| ["f'{3:{{>10}'", | |
| "f'{3'", | |
| "f'{3!'", | |
| "f'{3:'", | |
| "f'{3!s'", | |
| "f'{3!s:'", | |
| "f'{3!s:3'", | |
| "f'x{'", | |
| "f'x{x'", | |
| "f'{x'", | |
| "f'{3:s'", | |
| "f'{{{'", | |
| "f'{{}}{'", | |
| "f'{'", | |
| "f'x{<'", # See bpo-46762. | |
| "f'x{>'", | |
| ]) | |
| # But these are just normal strings. | |
| self.assertEqual(f'{"{"}', '{') | |
| self.assertEqual(f'{"}"}', '}') | |
| self.assertEqual(f'{3:{"}"}>10}', '}}}}}}}}}3') | |
| self.assertEqual(f'{2:{"{"}>10}', '{{{{{{{{{2') | |
| def test_if_conditional(self): | |
| # There's special logic in compile.c to test if the | |
| # conditional for an if (and while) are constants. Exercise | |
| # that code. | |
| def test_fstring(x, expected): | |
| flag = 0 | |
| if f'{x}': | |
| flag = 1 | |
| else: | |
| flag = 2 | |
| self.assertEqual(flag, expected) | |
| def test_concat_empty(x, expected): | |
| flag = 0 | |
| if '' f'{x}': | |
| flag = 1 | |
| else: | |
| flag = 2 | |
| self.assertEqual(flag, expected) | |
| def test_concat_non_empty(x, expected): | |
| flag = 0 | |
| if ' ' f'{x}': | |
| flag = 1 | |
| else: | |
| flag = 2 | |
| self.assertEqual(flag, expected) | |
| test_fstring('', 2) | |
| test_fstring(' ', 1) | |
| test_concat_empty('', 2) | |
| test_concat_empty(' ', 1) | |
| test_concat_non_empty('', 1) | |
| test_concat_non_empty(' ', 1) | |
| def test_empty_format_specifier(self): | |
| x = 'test' | |
| self.assertEqual(f'{x}', 'test') | |
| self.assertEqual(f'{x:}', 'test') | |
| self.assertEqual(f'{x!s:}', 'test') | |
| self.assertEqual(f'{x!r:}', "'test'") | |
| def test_str_format_differences(self): | |
| d = {'a': 'string', | |
| 0: 'integer', | |
| } | |
| a = 0 | |
| self.assertEqual(f'{d[0]}', 'integer') | |
| self.assertEqual(f'{d["a"]}', 'string') | |
| self.assertEqual(f'{d[a]}', 'integer') | |
| self.assertEqual('{d[a]}'.format(d=d), 'string') | |
| self.assertEqual('{d[0]}'.format(d=d), 'integer') | |
| def test_errors(self): | |
| # see issue 26287 | |
| self.assertAllRaise(TypeError, 'unsupported', | |
| [r"f'{(lambda: 0):x}'", | |
| r"f'{(0,):x}'", | |
| ]) | |
| self.assertAllRaise(ValueError, 'Unknown format code', | |
| [r"f'{1000:j}'", | |
| r"f'{1000:j}'", | |
| ]) | |
| def test_filename_in_syntaxerror(self): | |
| # see issue 38964 | |
| with temp_cwd() as cwd: | |
| file_path = os.path.join(cwd, 't.py') | |
| with open(file_path, 'w', encoding="utf-8") as f: | |
| f.write('f"{a b}"') # This generates a SyntaxError | |
| _, _, stderr = assert_python_failure(file_path, | |
| PYTHONIOENCODING='ascii') | |
| self.assertIn(file_path.encode('ascii', 'backslashreplace'), stderr) | |
| def test_loop(self): | |
| for i in range(1000): | |
| self.assertEqual(f'i:{i}', 'i:' + str(i)) | |
| def test_dict(self): | |
| d = {'"': 'dquote', | |
| "'": 'squote', | |
| 'foo': 'bar', | |
| } | |
| self.assertEqual(f'''{d["'"]}''', 'squote') | |
| self.assertEqual(f"""{d['"']}""", 'dquote') | |
| self.assertEqual(f'{d["foo"]}', 'bar') | |
| self.assertEqual(f"{d['foo']}", 'bar') | |
| def test_backslash_char(self): | |
| # Check eval of a backslash followed by a control char. | |
| # See bpo-30682: this used to raise an assert in pydebug mode. | |
| self.assertEqual(eval('f"\\\n"'), '') | |
| self.assertEqual(eval('f"\\\r"'), '') | |
| def test_debug_conversion(self): | |
| x = 'A string' | |
| self.assertEqual(f'{x=}', 'x=' + repr(x)) | |
| self.assertEqual(f'{x =}', 'x =' + repr(x)) | |
| self.assertEqual(f'{x=!s}', 'x=' + str(x)) | |
| self.assertEqual(f'{x=!r}', 'x=' + repr(x)) | |
| self.assertEqual(f'{x=!a}', 'x=' + ascii(x)) | |
| x = 2.71828 | |
| self.assertEqual(f'{x=:.2f}', 'x=' + format(x, '.2f')) | |
| self.assertEqual(f'{x=:}', 'x=' + format(x, '')) | |
| self.assertEqual(f'{x=!r:^20}', 'x=' + format(repr(x), '^20')) | |
| self.assertEqual(f'{x=!s:^20}', 'x=' + format(str(x), '^20')) | |
| self.assertEqual(f'{x=!a:^20}', 'x=' + format(ascii(x), '^20')) | |
| x = 9 | |
| self.assertEqual(f'{3*x+15=}', '3*x+15=42') | |
| # There is code in ast.c that deals with non-ascii expression values. So, | |
| # use a unicode identifier to trigger that. | |
| tenπ = 31.4 | |
| self.assertEqual(f'{tenπ=:.2f}', 'tenπ=31.40') | |
| # Also test with Unicode in non-identifiers. | |
| self.assertEqual(f'{"Σ"=}', '"Σ"=\'Σ\'') | |
| # Make sure nested fstrings still work. | |
| self.assertEqual(f'{f"{3.1415=:.1f}":*^20}', '*****3.1415=3.1*****') | |
| # Make sure text before and after an expression with = works | |
| # correctly. | |
| pi = 'π' | |
| self.assertEqual(f'alpha α {pi=} ω omega', "alpha α pi='π' ω omega") | |
| # Check multi-line expressions. | |
| self.assertEqual(f'''{ | |
| 3 | |
| =}''', '\n3\n=3') | |
| # Since = is handled specially, make sure all existing uses of | |
| # it still work. | |
| self.assertEqual(f'{0==1}', 'False') | |
| self.assertEqual(f'{0!=1}', 'True') | |
| self.assertEqual(f'{0<=1}', 'True') | |
| self.assertEqual(f'{0>=1}', 'False') | |
| self.assertEqual(f'{(x:="5")}', '5') | |
| self.assertEqual(x, '5') | |
| self.assertEqual(f'{(x:=5)}', '5') | |
| self.assertEqual(x, 5) | |
| self.assertEqual(f'{"="}', '=') | |
| x = 20 | |
| # This isn't an assignment expression, it's 'x', with a format | |
| # spec of '=10'. See test_walrus: you need to use parens. | |
| self.assertEqual(f'{x:=10}', ' 20') | |
| # Test named function parameters, to make sure '=' parsing works | |
| # there. | |
| def f(a): | |
| nonlocal x | |
| oldx = x | |
| x = a | |
| return oldx | |
| x = 0 | |
| self.assertEqual(f'{f(a="3=")}', '0') | |
| self.assertEqual(x, '3=') | |
| self.assertEqual(f'{f(a=4)}', '3=') | |
| self.assertEqual(x, 4) | |
| # Make sure __format__ is being called. | |
| class C: | |
| def __format__(self, s): | |
| return f'FORMAT-{s}' | |
| def __repr__(self): | |
| return 'REPR' | |
| self.assertEqual(f'{C()=}', 'C()=REPR') | |
| self.assertEqual(f'{C()=!r}', 'C()=REPR') | |
| self.assertEqual(f'{C()=:}', 'C()=FORMAT-') | |
| self.assertEqual(f'{C()=: }', 'C()=FORMAT- ') | |
| self.assertEqual(f'{C()=:x}', 'C()=FORMAT-x') | |
| self.assertEqual(f'{C()=!r:*^20}', 'C()=********REPR********') | |
| self.assertRaises(SyntaxError, eval, "f'{C=]'") | |
| # Make sure leading and following text works. | |
| x = 'foo' | |
| self.assertEqual(f'X{x=}Y', 'Xx='+repr(x)+'Y') | |
| # Make sure whitespace around the = works. | |
| self.assertEqual(f'X{x =}Y', 'Xx ='+repr(x)+'Y') | |
| self.assertEqual(f'X{x= }Y', 'Xx= '+repr(x)+'Y') | |
| self.assertEqual(f'X{x = }Y', 'Xx = '+repr(x)+'Y') | |
| # These next lines contains tabs. Backslash escapes don't | |
| # work in f-strings. | |
| # patchcheck doesn't like these tabs. So the only way to test | |
| # this will be to dynamically created and exec the f-strings. But | |
| # that's such a hassle I'll save it for another day. For now, convert | |
| # the tabs to spaces just to shut up patchcheck. | |
| #self.assertEqual(f'X{x =}Y', 'Xx\t='+repr(x)+'Y') | |
| #self.assertEqual(f'X{x = }Y', 'Xx\t=\t'+repr(x)+'Y') | |
| def test_walrus(self): | |
| x = 20 | |
| # This isn't an assignment expression, it's 'x', with a format | |
| # spec of '=10'. | |
| self.assertEqual(f'{x:=10}', ' 20') | |
| # This is an assignment expression, which requires parens. | |
| self.assertEqual(f'{(x:=10)}', '10') | |
| self.assertEqual(x, 10) | |
| def test_invalid_syntax_error_message(self): | |
| with self.assertRaisesRegex(SyntaxError, "f-string: invalid syntax"): | |
| compile("f'{a $ b}'", "?", "exec") | |
| def test_with_two_commas_in_format_specifier(self): | |
| error_msg = re.escape("Cannot specify ',' with ','.") | |
| with self.assertRaisesRegex(ValueError, error_msg): | |
| f'{1:,,}' | |
| def test_with_two_underscore_in_format_specifier(self): | |
| error_msg = re.escape("Cannot specify '_' with '_'.") | |
| with self.assertRaisesRegex(ValueError, error_msg): | |
| f'{1:__}' | |
| def test_with_a_commas_and_an_underscore_in_format_specifier(self): | |
| error_msg = re.escape("Cannot specify both ',' and '_'.") | |
| with self.assertRaisesRegex(ValueError, error_msg): | |
| f'{1:,_}' | |
| def test_with_an_underscore_and_a_comma_in_format_specifier(self): | |
| error_msg = re.escape("Cannot specify both ',' and '_'.") | |
| with self.assertRaisesRegex(ValueError, error_msg): | |
| f'{1:_,}' | |
| def test_syntax_error_for_starred_expressions(self): | |
| error_msg = re.escape("cannot use starred expression here") | |
| with self.assertRaisesRegex(SyntaxError, error_msg): | |
| compile("f'{*a}'", "?", "exec") | |
| error_msg = re.escape("cannot use double starred expression here") | |
| with self.assertRaisesRegex(SyntaxError, error_msg): | |
| compile("f'{**a}'", "?", "exec") | |
| if __name__ == '__main__': | |
| unittest.main() |