| """Test cases for traceback module""" |
| |
| from collections import namedtuple |
| from io import StringIO |
| import linecache |
| import sys |
| import unittest |
| import re |
| from test import support |
| from test.support import Error, captured_output, cpython_only, ALWAYS_EQ |
| from test.support.os_helper import TESTFN, unlink |
| from test.support.script_helper import assert_python_ok |
| import textwrap |
| |
| import traceback |
| |
| |
| test_code = namedtuple('code', ['co_filename', 'co_name']) |
| test_frame = namedtuple('frame', ['f_code', 'f_globals', 'f_locals']) |
| test_tb = namedtuple('tb', ['tb_frame', 'tb_lineno', 'tb_next']) |
| |
| |
| class TracebackCases(unittest.TestCase): |
| # For now, a very minimal set of tests. I want to be sure that |
| # formatting of SyntaxErrors works based on changes for 2.1. |
| |
| def get_exception_format(self, func, exc): |
| try: |
| func() |
| except exc as value: |
| return traceback.format_exception_only(exc, value) |
| else: |
| raise ValueError("call did not raise exception") |
| |
| def syntax_error_with_caret(self): |
| compile("def fact(x):\n\treturn x!\n", "?", "exec") |
| |
| def syntax_error_with_caret_2(self): |
| compile("1 +\n", "?", "exec") |
| |
| def syntax_error_bad_indentation(self): |
| compile("def spam():\n print(1)\n print(2)", "?", "exec") |
| |
| def syntax_error_with_caret_non_ascii(self): |
| compile('Python = "\u1e54\xfd\u0163\u0125\xf2\xf1" +', "?", "exec") |
| |
| def syntax_error_bad_indentation2(self): |
| compile(" print(2)", "?", "exec") |
| |
| def test_caret(self): |
| err = self.get_exception_format(self.syntax_error_with_caret, |
| SyntaxError) |
| self.assertEqual(len(err), 4) |
| self.assertTrue(err[1].strip() == "return x!") |
| self.assertIn("^", err[2]) # third line has caret |
| self.assertEqual(err[1].find("!"), err[2].find("^")) # in the right place |
| |
| err = self.get_exception_format(self.syntax_error_with_caret_2, |
| SyntaxError) |
| self.assertIn("^", err[2]) # third line has caret |
| self.assertEqual(err[2].count('\n'), 1) # and no additional newline |
| self.assertEqual(err[1].find("+") + 1, err[2].find("^")) # in the right place |
| |
| err = self.get_exception_format(self.syntax_error_with_caret_non_ascii, |
| SyntaxError) |
| self.assertIn("^", err[2]) # third line has caret |
| self.assertEqual(err[2].count('\n'), 1) # and no additional newline |
| self.assertEqual(err[1].find("+") + 1, err[2].find("^")) # in the right place |
| |
| def test_nocaret(self): |
| exc = SyntaxError("error", ("x.py", 23, None, "bad syntax")) |
| err = traceback.format_exception_only(SyntaxError, exc) |
| self.assertEqual(len(err), 3) |
| self.assertEqual(err[1].strip(), "bad syntax") |
| |
| def test_bad_indentation(self): |
| err = self.get_exception_format(self.syntax_error_bad_indentation, |
| IndentationError) |
| self.assertEqual(len(err), 4) |
| self.assertEqual(err[1].strip(), "print(2)") |
| self.assertIn("^", err[2]) |
| self.assertEqual(err[1].find(")") + 1, err[2].find("^")) |
| |
| # No caret for "unexpected indent" |
| err = self.get_exception_format(self.syntax_error_bad_indentation2, |
| IndentationError) |
| self.assertEqual(len(err), 3) |
| self.assertEqual(err[1].strip(), "print(2)") |
| |
| def test_base_exception(self): |
| # Test that exceptions derived from BaseException are formatted right |
| e = KeyboardInterrupt() |
| lst = traceback.format_exception_only(e.__class__, e) |
| self.assertEqual(lst, ['KeyboardInterrupt\n']) |
| |
| def test_format_exception_only_bad__str__(self): |
| class X(Exception): |
| def __str__(self): |
| 1/0 |
| err = traceback.format_exception_only(X, X()) |
| self.assertEqual(len(err), 1) |
| str_value = '<unprintable %s object>' % X.__name__ |
| if X.__module__ in ('__main__', 'builtins'): |
| str_name = X.__qualname__ |
| else: |
| str_name = '.'.join([X.__module__, X.__qualname__]) |
| self.assertEqual(err[0], "%s: %s\n" % (str_name, str_value)) |
| |
| def test_encoded_file(self): |
| # Test that tracebacks are correctly printed for encoded source files: |
| # - correct line number (Issue2384) |
| # - respect file encoding (Issue3975) |
| import sys, subprocess |
| |
| # The spawned subprocess has its stdout redirected to a PIPE, and its |
| # encoding may be different from the current interpreter, on Windows |
| # at least. |
| process = subprocess.Popen([sys.executable, "-c", |
| "import sys; print(sys.stdout.encoding)"], |
| stdout=subprocess.PIPE, |
| stderr=subprocess.STDOUT) |
| stdout, stderr = process.communicate() |
| output_encoding = str(stdout, 'ascii').splitlines()[0] |
| |
| def do_test(firstlines, message, charset, lineno): |
| # Raise the message in a subprocess, and catch the output |
| try: |
| with open(TESTFN, "w", encoding=charset) as output: |
| output.write("""{0}if 1: |
| import traceback; |
| raise RuntimeError('{1}') |
| """.format(firstlines, message)) |
| |
| process = subprocess.Popen([sys.executable, TESTFN], |
| stdout=subprocess.PIPE, stderr=subprocess.STDOUT) |
| stdout, stderr = process.communicate() |
| stdout = stdout.decode(output_encoding).splitlines() |
| finally: |
| unlink(TESTFN) |
| |
| # The source lines are encoded with the 'backslashreplace' handler |
| encoded_message = message.encode(output_encoding, |
| 'backslashreplace') |
| # and we just decoded them with the output_encoding. |
| message_ascii = encoded_message.decode(output_encoding) |
| |
| err_line = "raise RuntimeError('{0}')".format(message_ascii) |
| err_msg = "RuntimeError: {0}".format(message_ascii) |
| |
| self.assertIn(("line %s" % lineno), stdout[1], |
| "Invalid line number: {0!r} instead of {1}".format( |
| stdout[1], lineno)) |
| self.assertTrue(stdout[2].endswith(err_line), |
| "Invalid traceback line: {0!r} instead of {1!r}".format( |
| stdout[2], err_line)) |
| self.assertTrue(stdout[3] == err_msg, |
| "Invalid error message: {0!r} instead of {1!r}".format( |
| stdout[3], err_msg)) |
| |
| do_test("", "foo", "ascii", 3) |
| for charset in ("ascii", "iso-8859-1", "utf-8", "GBK"): |
| if charset == "ascii": |
| text = "foo" |
| elif charset == "GBK": |
| text = "\u4E02\u5100" |
| else: |
| text = "h\xe9 ho" |
| do_test("# coding: {0}\n".format(charset), |
| text, charset, 4) |
| do_test("#!shebang\n# coding: {0}\n".format(charset), |
| text, charset, 5) |
| do_test(" \t\f\n# coding: {0}\n".format(charset), |
| text, charset, 5) |
| # Issue #18960: coding spec should have no effect |
| do_test("x=0\n# coding: GBK\n", "h\xe9 ho", 'utf-8', 5) |
| |
| def test_print_traceback_at_exit(self): |
| # Issue #22599: Ensure that it is possible to use the traceback module |
| # to display an exception at Python exit |
| code = textwrap.dedent(""" |
| import sys |
| import traceback |
| |
| class PrintExceptionAtExit(object): |
| def __init__(self): |
| try: |
| x = 1 / 0 |
| except Exception: |
| self.exc_info = sys.exc_info() |
| # self.exc_info[1] (traceback) contains frames: |
| # explicitly clear the reference to self in the current |
| # frame to break a reference cycle |
| self = None |
| |
| def __del__(self): |
| traceback.print_exception(*self.exc_info) |
| |
| # Keep a reference in the module namespace to call the destructor |
| # when the module is unloaded |
| obj = PrintExceptionAtExit() |
| """) |
| rc, stdout, stderr = assert_python_ok('-c', code) |
| expected = [b'Traceback (most recent call last):', |
| b' File "<string>", line 8, in __init__', |
| b'ZeroDivisionError: division by zero'] |
| self.assertEqual(stderr.splitlines(), expected) |
| |
| def test_print_exception(self): |
| output = StringIO() |
| traceback.print_exception( |
| Exception, Exception("projector"), None, file=output |
| ) |
| self.assertEqual(output.getvalue(), "Exception: projector\n") |
| |
| |
| class TracebackFormatTests(unittest.TestCase): |
| |
| def some_exception(self): |
| raise KeyError('blah') |
| |
| @cpython_only |
| def check_traceback_format(self, cleanup_func=None): |
| from _testcapi import traceback_print |
| try: |
| self.some_exception() |
| except KeyError: |
| type_, value, tb = sys.exc_info() |
| if cleanup_func is not None: |
| # Clear the inner frames, not this one |
| cleanup_func(tb.tb_next) |
| traceback_fmt = 'Traceback (most recent call last):\n' + \ |
| ''.join(traceback.format_tb(tb)) |
| file_ = StringIO() |
| traceback_print(tb, file_) |
| python_fmt = file_.getvalue() |
| # Call all _tb and _exc functions |
| with captured_output("stderr") as tbstderr: |
| traceback.print_tb(tb) |
| tbfile = StringIO() |
| traceback.print_tb(tb, file=tbfile) |
| with captured_output("stderr") as excstderr: |
| traceback.print_exc() |
| excfmt = traceback.format_exc() |
| excfile = StringIO() |
| traceback.print_exc(file=excfile) |
| else: |
| raise Error("unable to create test traceback string") |
| |
| # Make sure that Python and the traceback module format the same thing |
| self.assertEqual(traceback_fmt, python_fmt) |
| # Now verify the _tb func output |
| self.assertEqual(tbstderr.getvalue(), tbfile.getvalue()) |
| # Now verify the _exc func output |
| self.assertEqual(excstderr.getvalue(), excfile.getvalue()) |
| self.assertEqual(excfmt, excfile.getvalue()) |
| |
| # Make sure that the traceback is properly indented. |
| tb_lines = python_fmt.splitlines() |
| self.assertEqual(len(tb_lines), 5) |
| banner = tb_lines[0] |
| location, source_line = tb_lines[-2:] |
| self.assertTrue(banner.startswith('Traceback')) |
| self.assertTrue(location.startswith(' File')) |
| self.assertTrue(source_line.startswith(' raise')) |
| |
| def test_traceback_format(self): |
| self.check_traceback_format() |
| |
| def test_traceback_format_with_cleared_frames(self): |
| # Check that traceback formatting also works with a clear()ed frame |
| def cleanup_tb(tb): |
| tb.tb_frame.clear() |
| self.check_traceback_format(cleanup_tb) |
| |
| def test_stack_format(self): |
| # Verify _stack functions. Note we have to use _getframe(1) to |
| # compare them without this frame appearing in the output |
| with captured_output("stderr") as ststderr: |
| traceback.print_stack(sys._getframe(1)) |
| stfile = StringIO() |
| traceback.print_stack(sys._getframe(1), file=stfile) |
| self.assertEqual(ststderr.getvalue(), stfile.getvalue()) |
| |
| stfmt = traceback.format_stack(sys._getframe(1)) |
| |
| self.assertEqual(ststderr.getvalue(), "".join(stfmt)) |
| |
| def test_print_stack(self): |
| def prn(): |
| traceback.print_stack() |
| with captured_output("stderr") as stderr: |
| prn() |
| lineno = prn.__code__.co_firstlineno |
| self.assertEqual(stderr.getvalue().splitlines()[-4:], [ |
| ' File "%s", line %d, in test_print_stack' % (__file__, lineno+3), |
| ' prn()', |
| ' File "%s", line %d, in prn' % (__file__, lineno+1), |
| ' traceback.print_stack()', |
| ]) |
| |
| # issue 26823 - Shrink recursive tracebacks |
| def _check_recursive_traceback_display(self, render_exc): |
| # Always show full diffs when this test fails |
| # Note that rearranging things may require adjusting |
| # the relative line numbers in the expected tracebacks |
| self.maxDiff = None |
| |
| # Check hitting the recursion limit |
| def f(): |
| f() |
| |
| with captured_output("stderr") as stderr_f: |
| try: |
| f() |
| except RecursionError: |
| render_exc() |
| else: |
| self.fail("no recursion occurred") |
| |
| lineno_f = f.__code__.co_firstlineno |
| result_f = ( |
| 'Traceback (most recent call last):\n' |
| f' File "{__file__}", line {lineno_f+5}, in _check_recursive_traceback_display\n' |
| ' f()\n' |
| f' File "{__file__}", line {lineno_f+1}, in f\n' |
| ' f()\n' |
| f' File "{__file__}", line {lineno_f+1}, in f\n' |
| ' f()\n' |
| f' File "{__file__}", line {lineno_f+1}, in f\n' |
| ' f()\n' |
| # XXX: The following line changes depending on whether the tests |
| # are run through the interactive interpreter or with -m |
| # It also varies depending on the platform (stack size) |
| # Fortunately, we don't care about exactness here, so we use regex |
| r' \[Previous line repeated (\d+) more times\]' '\n' |
| 'RecursionError: maximum recursion depth exceeded\n' |
| ) |
| |
| expected = result_f.splitlines() |
| actual = stderr_f.getvalue().splitlines() |
| |
| # Check the output text matches expectations |
| # 2nd last line contains the repetition count |
| self.assertEqual(actual[:-2], expected[:-2]) |
| self.assertRegex(actual[-2], expected[-2]) |
| # last line can have additional text appended |
| self.assertIn(expected[-1], actual[-1]) |
| |
| # Check the recursion count is roughly as expected |
| rec_limit = sys.getrecursionlimit() |
| self.assertIn(int(re.search(r"\d+", actual[-2]).group()), range(rec_limit-60, rec_limit)) |
| |
| # Check a known (limited) number of recursive invocations |
| def g(count=10): |
| if count: |
| return g(count-1) |
| raise ValueError |
| |
| with captured_output("stderr") as stderr_g: |
| try: |
| g() |
| except ValueError: |
| render_exc() |
| else: |
| self.fail("no value error was raised") |
| |
| lineno_g = g.__code__.co_firstlineno |
| result_g = ( |
| f' File "{__file__}", line {lineno_g+2}, in g\n' |
| ' return g(count-1)\n' |
| f' File "{__file__}", line {lineno_g+2}, in g\n' |
| ' return g(count-1)\n' |
| f' File "{__file__}", line {lineno_g+2}, in g\n' |
| ' return g(count-1)\n' |
| ' [Previous line repeated 7 more times]\n' |
| f' File "{__file__}", line {lineno_g+3}, in g\n' |
| ' raise ValueError\n' |
| 'ValueError\n' |
| ) |
| tb_line = ( |
| 'Traceback (most recent call last):\n' |
| f' File "{__file__}", line {lineno_g+7}, in _check_recursive_traceback_display\n' |
| ' g()\n' |
| ) |
| expected = (tb_line + result_g).splitlines() |
| actual = stderr_g.getvalue().splitlines() |
| self.assertEqual(actual, expected) |
| |
| # Check 2 different repetitive sections |
| def h(count=10): |
| if count: |
| return h(count-1) |
| g() |
| |
| with captured_output("stderr") as stderr_h: |
| try: |
| h() |
| except ValueError: |
| render_exc() |
| else: |
| self.fail("no value error was raised") |
| |
| lineno_h = h.__code__.co_firstlineno |
| result_h = ( |
| 'Traceback (most recent call last):\n' |
| f' File "{__file__}", line {lineno_h+7}, in _check_recursive_traceback_display\n' |
| ' h()\n' |
| f' File "{__file__}", line {lineno_h+2}, in h\n' |
| ' return h(count-1)\n' |
| f' File "{__file__}", line {lineno_h+2}, in h\n' |
| ' return h(count-1)\n' |
| f' File "{__file__}", line {lineno_h+2}, in h\n' |
| ' return h(count-1)\n' |
| ' [Previous line repeated 7 more times]\n' |
| f' File "{__file__}", line {lineno_h+3}, in h\n' |
| ' g()\n' |
| ) |
| expected = (result_h + result_g).splitlines() |
| actual = stderr_h.getvalue().splitlines() |
| self.assertEqual(actual, expected) |
| |
| # Check the boundary conditions. First, test just below the cutoff. |
| with captured_output("stderr") as stderr_g: |
| try: |
| g(traceback._RECURSIVE_CUTOFF) |
| except ValueError: |
| render_exc() |
| else: |
| self.fail("no error raised") |
| result_g = ( |
| f' File "{__file__}", line {lineno_g+2}, in g\n' |
| ' return g(count-1)\n' |
| f' File "{__file__}", line {lineno_g+2}, in g\n' |
| ' return g(count-1)\n' |
| f' File "{__file__}", line {lineno_g+2}, in g\n' |
| ' return g(count-1)\n' |
| f' File "{__file__}", line {lineno_g+3}, in g\n' |
| ' raise ValueError\n' |
| 'ValueError\n' |
| ) |
| tb_line = ( |
| 'Traceback (most recent call last):\n' |
| f' File "{__file__}", line {lineno_g+71}, in _check_recursive_traceback_display\n' |
| ' g(traceback._RECURSIVE_CUTOFF)\n' |
| ) |
| expected = (tb_line + result_g).splitlines() |
| actual = stderr_g.getvalue().splitlines() |
| self.assertEqual(actual, expected) |
| |
| # Second, test just above the cutoff. |
| with captured_output("stderr") as stderr_g: |
| try: |
| g(traceback._RECURSIVE_CUTOFF + 1) |
| except ValueError: |
| render_exc() |
| else: |
| self.fail("no error raised") |
| result_g = ( |
| f' File "{__file__}", line {lineno_g+2}, in g\n' |
| ' return g(count-1)\n' |
| f' File "{__file__}", line {lineno_g+2}, in g\n' |
| ' return g(count-1)\n' |
| f' File "{__file__}", line {lineno_g+2}, in g\n' |
| ' return g(count-1)\n' |
| ' [Previous line repeated 1 more time]\n' |
| f' File "{__file__}", line {lineno_g+3}, in g\n' |
| ' raise ValueError\n' |
| 'ValueError\n' |
| ) |
| tb_line = ( |
| 'Traceback (most recent call last):\n' |
| f' File "{__file__}", line {lineno_g+99}, in _check_recursive_traceback_display\n' |
| ' g(traceback._RECURSIVE_CUTOFF + 1)\n' |
| ) |
| expected = (tb_line + result_g).splitlines() |
| actual = stderr_g.getvalue().splitlines() |
| self.assertEqual(actual, expected) |
| |
| def test_recursive_traceback_python(self): |
| self._check_recursive_traceback_display(traceback.print_exc) |
| |
| @cpython_only |
| def test_recursive_traceback_cpython_internal(self): |
| from _testcapi import exception_print |
| def render_exc(): |
| exc_type, exc_value, exc_tb = sys.exc_info() |
| exception_print(exc_value) |
| self._check_recursive_traceback_display(render_exc) |
| |
| def test_format_stack(self): |
| def fmt(): |
| return traceback.format_stack() |
| result = fmt() |
| lineno = fmt.__code__.co_firstlineno |
| self.assertEqual(result[-2:], [ |
| ' File "%s", line %d, in test_format_stack\n' |
| ' result = fmt()\n' % (__file__, lineno+2), |
| ' File "%s", line %d, in fmt\n' |
| ' return traceback.format_stack()\n' % (__file__, lineno+1), |
| ]) |
| |
| @cpython_only |
| def test_unhashable(self): |
| from _testcapi import exception_print |
| |
| class UnhashableException(Exception): |
| def __eq__(self, other): |
| return True |
| |
| ex1 = UnhashableException('ex1') |
| ex2 = UnhashableException('ex2') |
| try: |
| raise ex2 from ex1 |
| except UnhashableException: |
| try: |
| raise ex1 |
| except UnhashableException: |
| exc_type, exc_val, exc_tb = sys.exc_info() |
| |
| with captured_output("stderr") as stderr_f: |
| exception_print(exc_val) |
| |
| tb = stderr_f.getvalue().strip().splitlines() |
| self.assertEqual(11, len(tb)) |
| self.assertEqual(context_message.strip(), tb[5]) |
| self.assertIn('UnhashableException: ex2', tb[3]) |
| self.assertIn('UnhashableException: ex1', tb[10]) |
| |
| |
| cause_message = ( |
| "\nThe above exception was the direct cause " |
| "of the following exception:\n\n") |
| |
| context_message = ( |
| "\nDuring handling of the above exception, " |
| "another exception occurred:\n\n") |
| |
| boundaries = re.compile( |
| '(%s|%s)' % (re.escape(cause_message), re.escape(context_message))) |
| |
| |
| class BaseExceptionReportingTests: |
| |
| def get_exception(self, exception_or_callable): |
| if isinstance(exception_or_callable, Exception): |
| return exception_or_callable |
| try: |
| exception_or_callable() |
| except Exception as e: |
| return e |
| |
| def zero_div(self): |
| 1/0 # In zero_div |
| |
| def check_zero_div(self, msg): |
| lines = msg.splitlines() |
| self.assertTrue(lines[-3].startswith(' File')) |
| self.assertIn('1/0 # In zero_div', lines[-2]) |
| self.assertTrue(lines[-1].startswith('ZeroDivisionError'), lines[-1]) |
| |
| def test_simple(self): |
| try: |
| 1/0 # Marker |
| except ZeroDivisionError as _: |
| e = _ |
| lines = self.get_report(e).splitlines() |
| self.assertEqual(len(lines), 4) |
| self.assertTrue(lines[0].startswith('Traceback')) |
| self.assertTrue(lines[1].startswith(' File')) |
| self.assertIn('1/0 # Marker', lines[2]) |
| self.assertTrue(lines[3].startswith('ZeroDivisionError')) |
| |
| def test_cause(self): |
| def inner_raise(): |
| try: |
| self.zero_div() |
| except ZeroDivisionError as e: |
| raise KeyError from e |
| def outer_raise(): |
| inner_raise() # Marker |
| blocks = boundaries.split(self.get_report(outer_raise)) |
| self.assertEqual(len(blocks), 3) |
| self.assertEqual(blocks[1], cause_message) |
| self.check_zero_div(blocks[0]) |
| self.assertIn('inner_raise() # Marker', blocks[2]) |
| |
| def test_context(self): |
| def inner_raise(): |
| try: |
| self.zero_div() |
| except ZeroDivisionError: |
| raise KeyError |
| def outer_raise(): |
| inner_raise() # Marker |
| blocks = boundaries.split(self.get_report(outer_raise)) |
| self.assertEqual(len(blocks), 3) |
| self.assertEqual(blocks[1], context_message) |
| self.check_zero_div(blocks[0]) |
| self.assertIn('inner_raise() # Marker', blocks[2]) |
| |
| def test_context_suppression(self): |
| try: |
| try: |
| raise Exception |
| except: |
| raise ZeroDivisionError from None |
| except ZeroDivisionError as _: |
| e = _ |
| lines = self.get_report(e).splitlines() |
| self.assertEqual(len(lines), 4) |
| self.assertTrue(lines[0].startswith('Traceback')) |
| self.assertTrue(lines[1].startswith(' File')) |
| self.assertIn('ZeroDivisionError from None', lines[2]) |
| self.assertTrue(lines[3].startswith('ZeroDivisionError')) |
| |
| def test_cause_and_context(self): |
| # When both a cause and a context are set, only the cause should be |
| # displayed and the context should be muted. |
| def inner_raise(): |
| try: |
| self.zero_div() |
| except ZeroDivisionError as _e: |
| e = _e |
| try: |
| xyzzy |
| except NameError: |
| raise KeyError from e |
| def outer_raise(): |
| inner_raise() # Marker |
| blocks = boundaries.split(self.get_report(outer_raise)) |
| self.assertEqual(len(blocks), 3) |
| self.assertEqual(blocks[1], cause_message) |
| self.check_zero_div(blocks[0]) |
| self.assertIn('inner_raise() # Marker', blocks[2]) |
| |
| def test_cause_recursive(self): |
| def inner_raise(): |
| try: |
| try: |
| self.zero_div() |
| except ZeroDivisionError as e: |
| z = e |
| raise KeyError from e |
| except KeyError as e: |
| raise z from e |
| def outer_raise(): |
| inner_raise() # Marker |
| blocks = boundaries.split(self.get_report(outer_raise)) |
| self.assertEqual(len(blocks), 3) |
| self.assertEqual(blocks[1], cause_message) |
| # The first block is the KeyError raised from the ZeroDivisionError |
| self.assertIn('raise KeyError from e', blocks[0]) |
| self.assertNotIn('1/0', blocks[0]) |
| # The second block (apart from the boundary) is the ZeroDivisionError |
| # re-raised from the KeyError |
| self.assertIn('inner_raise() # Marker', blocks[2]) |
| self.check_zero_div(blocks[2]) |
| |
| def test_syntax_error_offset_at_eol(self): |
| # See #10186. |
| def e(): |
| raise SyntaxError('', ('', 0, 5, 'hello')) |
| msg = self.get_report(e).splitlines() |
| self.assertEqual(msg[-2], " ^") |
| def e(): |
| exec("x = 5 | 4 |") |
| msg = self.get_report(e).splitlines() |
| self.assertEqual(msg[-2], ' ^') |
| |
| def test_message_none(self): |
| # A message that looks like "None" should not be treated specially |
| err = self.get_report(Exception(None)) |
| self.assertIn('Exception: None\n', err) |
| err = self.get_report(Exception('None')) |
| self.assertIn('Exception: None\n', err) |
| err = self.get_report(Exception()) |
| self.assertIn('Exception\n', err) |
| err = self.get_report(Exception('')) |
| self.assertIn('Exception\n', err) |
| |
| def test_syntax_error_various_offsets(self): |
| for offset in range(-5, 10): |
| for add in [0, 2]: |
| text = " "*add + "text%d" % offset |
| expected = [' File "file.py", line 1'] |
| if offset < 1: |
| expected.append(" %s" % text.lstrip()) |
| elif offset <= 6: |
| expected.append(" %s" % text.lstrip()) |
| expected.append(" %s^" % (" "*(offset-1))) |
| else: |
| expected.append(" %s" % text.lstrip()) |
| expected.append(" %s^" % (" "*5)) |
| expected.append("SyntaxError: msg") |
| expected.append("") |
| err = self.get_report(SyntaxError("msg", ("file.py", 1, offset+add, text))) |
| exp = "\n".join(expected) |
| self.assertEqual(exp, err) |
| |
| |
| class PyExcReportingTests(BaseExceptionReportingTests, unittest.TestCase): |
| # |
| # This checks reporting through the 'traceback' module, with both |
| # format_exception() and print_exception(). |
| # |
| |
| def get_report(self, e): |
| e = self.get_exception(e) |
| s = ''.join( |
| traceback.format_exception(type(e), e, e.__traceback__)) |
| with captured_output("stderr") as sio: |
| traceback.print_exception(type(e), e, e.__traceback__) |
| self.assertEqual(sio.getvalue(), s) |
| return s |
| |
| |
| class CExcReportingTests(BaseExceptionReportingTests, unittest.TestCase): |
| # |
| # This checks built-in reporting by the interpreter. |
| # |
| |
| @cpython_only |
| def get_report(self, e): |
| from _testcapi import exception_print |
| e = self.get_exception(e) |
| with captured_output("stderr") as s: |
| exception_print(e) |
| return s.getvalue() |
| |
| |
| class LimitTests(unittest.TestCase): |
| |
| ''' Tests for limit argument. |
| It's enough to test extact_tb, extract_stack and format_exception ''' |
| |
| def last_raises1(self): |
| raise Exception('Last raised') |
| |
| def last_raises2(self): |
| self.last_raises1() |
| |
| def last_raises3(self): |
| self.last_raises2() |
| |
| def last_raises4(self): |
| self.last_raises3() |
| |
| def last_raises5(self): |
| self.last_raises4() |
| |
| def last_returns_frame1(self): |
| return sys._getframe() |
| |
| def last_returns_frame2(self): |
| return self.last_returns_frame1() |
| |
| def last_returns_frame3(self): |
| return self.last_returns_frame2() |
| |
| def last_returns_frame4(self): |
| return self.last_returns_frame3() |
| |
| def last_returns_frame5(self): |
| return self.last_returns_frame4() |
| |
| def test_extract_stack(self): |
| frame = self.last_returns_frame5() |
| def extract(**kwargs): |
| return traceback.extract_stack(frame, **kwargs) |
| def assertEqualExcept(actual, expected, ignore): |
| self.assertEqual(actual[:ignore], expected[:ignore]) |
| self.assertEqual(actual[ignore+1:], expected[ignore+1:]) |
| self.assertEqual(len(actual), len(expected)) |
| |
| with support.swap_attr(sys, 'tracebacklimit', 1000): |
| nolim = extract() |
| self.assertGreater(len(nolim), 5) |
| self.assertEqual(extract(limit=2), nolim[-2:]) |
| assertEqualExcept(extract(limit=100), nolim[-100:], -5-1) |
| self.assertEqual(extract(limit=-2), nolim[:2]) |
| assertEqualExcept(extract(limit=-100), nolim[:100], len(nolim)-5-1) |
| self.assertEqual(extract(limit=0), []) |
| del sys.tracebacklimit |
| assertEqualExcept(extract(), nolim, -5-1) |
| sys.tracebacklimit = 2 |
| self.assertEqual(extract(), nolim[-2:]) |
| self.assertEqual(extract(limit=3), nolim[-3:]) |
| self.assertEqual(extract(limit=-3), nolim[:3]) |
| sys.tracebacklimit = 0 |
| self.assertEqual(extract(), []) |
| sys.tracebacklimit = -1 |
| self.assertEqual(extract(), []) |
| |
| def test_extract_tb(self): |
| try: |
| self.last_raises5() |
| except Exception: |
| exc_type, exc_value, tb = sys.exc_info() |
| def extract(**kwargs): |
| return traceback.extract_tb(tb, **kwargs) |
| |
| with support.swap_attr(sys, 'tracebacklimit', 1000): |
| nolim = extract() |
| self.assertEqual(len(nolim), 5+1) |
| self.assertEqual(extract(limit=2), nolim[:2]) |
| self.assertEqual(extract(limit=10), nolim) |
| self.assertEqual(extract(limit=-2), nolim[-2:]) |
| self.assertEqual(extract(limit=-10), nolim) |
| self.assertEqual(extract(limit=0), []) |
| del sys.tracebacklimit |
| self.assertEqual(extract(), nolim) |
| sys.tracebacklimit = 2 |
| self.assertEqual(extract(), nolim[:2]) |
| self.assertEqual(extract(limit=3), nolim[:3]) |
| self.assertEqual(extract(limit=-3), nolim[-3:]) |
| sys.tracebacklimit = 0 |
| self.assertEqual(extract(), []) |
| sys.tracebacklimit = -1 |
| self.assertEqual(extract(), []) |
| |
| def test_format_exception(self): |
| try: |
| self.last_raises5() |
| except Exception: |
| exc_type, exc_value, tb = sys.exc_info() |
| # [1:-1] to exclude "Traceback (...)" header and |
| # exception type and value |
| def extract(**kwargs): |
| return traceback.format_exception(exc_type, exc_value, tb, **kwargs)[1:-1] |
| |
| with support.swap_attr(sys, 'tracebacklimit', 1000): |
| nolim = extract() |
| self.assertEqual(len(nolim), 5+1) |
| self.assertEqual(extract(limit=2), nolim[:2]) |
| self.assertEqual(extract(limit=10), nolim) |
| self.assertEqual(extract(limit=-2), nolim[-2:]) |
| self.assertEqual(extract(limit=-10), nolim) |
| self.assertEqual(extract(limit=0), []) |
| del sys.tracebacklimit |
| self.assertEqual(extract(), nolim) |
| sys.tracebacklimit = 2 |
| self.assertEqual(extract(), nolim[:2]) |
| self.assertEqual(extract(limit=3), nolim[:3]) |
| self.assertEqual(extract(limit=-3), nolim[-3:]) |
| sys.tracebacklimit = 0 |
| self.assertEqual(extract(), []) |
| sys.tracebacklimit = -1 |
| self.assertEqual(extract(), []) |
| |
| |
| class MiscTracebackCases(unittest.TestCase): |
| # |
| # Check non-printing functions in traceback module |
| # |
| |
| def test_clear(self): |
| def outer(): |
| middle() |
| def middle(): |
| inner() |
| def inner(): |
| i = 1 |
| 1/0 |
| |
| try: |
| outer() |
| except: |
| type_, value, tb = sys.exc_info() |
| |
| # Initial assertion: there's one local in the inner frame. |
| inner_frame = tb.tb_next.tb_next.tb_next.tb_frame |
| self.assertEqual(len(inner_frame.f_locals), 1) |
| |
| # Clear traceback frames |
| traceback.clear_frames(tb) |
| |
| # Local variable dict should now be empty. |
| self.assertEqual(len(inner_frame.f_locals), 0) |
| |
| def test_extract_stack(self): |
| def extract(): |
| return traceback.extract_stack() |
| result = extract() |
| lineno = extract.__code__.co_firstlineno |
| self.assertEqual(result[-2:], [ |
| (__file__, lineno+2, 'test_extract_stack', 'result = extract()'), |
| (__file__, lineno+1, 'extract', 'return traceback.extract_stack()'), |
| ]) |
| self.assertEqual(len(result[0]), 4) |
| |
| |
| class TestFrame(unittest.TestCase): |
| |
| def test_basics(self): |
| linecache.clearcache() |
| linecache.lazycache("f", globals()) |
| f = traceback.FrameSummary("f", 1, "dummy") |
| self.assertEqual(f, |
| ("f", 1, "dummy", '"""Test cases for traceback module"""')) |
| self.assertEqual(tuple(f), |
| ("f", 1, "dummy", '"""Test cases for traceback module"""')) |
| self.assertEqual(f, traceback.FrameSummary("f", 1, "dummy")) |
| self.assertEqual(f, tuple(f)) |
| # Since tuple.__eq__ doesn't support FrameSummary, the equality |
| # operator fallbacks to FrameSummary.__eq__. |
| self.assertEqual(tuple(f), f) |
| self.assertIsNone(f.locals) |
| self.assertNotEqual(f, object()) |
| self.assertEqual(f, ALWAYS_EQ) |
| |
| def test_lazy_lines(self): |
| linecache.clearcache() |
| f = traceback.FrameSummary("f", 1, "dummy", lookup_line=False) |
| self.assertEqual(None, f._line) |
| linecache.lazycache("f", globals()) |
| self.assertEqual( |
| '"""Test cases for traceback module"""', |
| f.line) |
| |
| def test_explicit_line(self): |
| f = traceback.FrameSummary("f", 1, "dummy", line="line") |
| self.assertEqual("line", f.line) |
| |
| def test_len(self): |
| f = traceback.FrameSummary("f", 1, "dummy", line="line") |
| self.assertEqual(len(f), 4) |
| |
| |
| class TestStack(unittest.TestCase): |
| |
| def test_walk_stack(self): |
| def deeper(): |
| return list(traceback.walk_stack(None)) |
| s1 = list(traceback.walk_stack(None)) |
| s2 = deeper() |
| self.assertEqual(len(s2) - len(s1), 1) |
| self.assertEqual(s2[1:], s1) |
| |
| def test_walk_tb(self): |
| try: |
| 1/0 |
| except Exception: |
| _, _, tb = sys.exc_info() |
| s = list(traceback.walk_tb(tb)) |
| self.assertEqual(len(s), 1) |
| |
| def test_extract_stack(self): |
| s = traceback.StackSummary.extract(traceback.walk_stack(None)) |
| self.assertIsInstance(s, traceback.StackSummary) |
| |
| def test_extract_stack_limit(self): |
| s = traceback.StackSummary.extract(traceback.walk_stack(None), limit=5) |
| self.assertEqual(len(s), 5) |
| |
| def test_extract_stack_lookup_lines(self): |
| linecache.clearcache() |
| linecache.updatecache('/foo.py', globals()) |
| c = test_code('/foo.py', 'method') |
| f = test_frame(c, None, None) |
| s = traceback.StackSummary.extract(iter([(f, 6)]), lookup_lines=True) |
| linecache.clearcache() |
| self.assertEqual(s[0].line, "import sys") |
| |
| def test_extract_stackup_deferred_lookup_lines(self): |
| linecache.clearcache() |
| c = test_code('/foo.py', 'method') |
| f = test_frame(c, None, None) |
| s = traceback.StackSummary.extract(iter([(f, 6)]), lookup_lines=False) |
| self.assertEqual({}, linecache.cache) |
| linecache.updatecache('/foo.py', globals()) |
| self.assertEqual(s[0].line, "import sys") |
| |
| def test_from_list(self): |
| s = traceback.StackSummary.from_list([('foo.py', 1, 'fred', 'line')]) |
| self.assertEqual( |
| [' File "foo.py", line 1, in fred\n line\n'], |
| s.format()) |
| |
| def test_from_list_edited_stack(self): |
| s = traceback.StackSummary.from_list([('foo.py', 1, 'fred', 'line')]) |
| s[0] = ('foo.py', 2, 'fred', 'line') |
| s2 = traceback.StackSummary.from_list(s) |
| self.assertEqual( |
| [' File "foo.py", line 2, in fred\n line\n'], |
| s2.format()) |
| |
| def test_format_smoke(self): |
| # For detailed tests see the format_list tests, which consume the same |
| # code. |
| s = traceback.StackSummary.from_list([('foo.py', 1, 'fred', 'line')]) |
| self.assertEqual( |
| [' File "foo.py", line 1, in fred\n line\n'], |
| s.format()) |
| |
| def test_locals(self): |
| linecache.updatecache('/foo.py', globals()) |
| c = test_code('/foo.py', 'method') |
| f = test_frame(c, globals(), {'something': 1}) |
| s = traceback.StackSummary.extract(iter([(f, 6)]), capture_locals=True) |
| self.assertEqual(s[0].locals, {'something': '1'}) |
| |
| def test_no_locals(self): |
| linecache.updatecache('/foo.py', globals()) |
| c = test_code('/foo.py', 'method') |
| f = test_frame(c, globals(), {'something': 1}) |
| s = traceback.StackSummary.extract(iter([(f, 6)])) |
| self.assertEqual(s[0].locals, None) |
| |
| def test_format_locals(self): |
| def some_inner(k, v): |
| a = 1 |
| b = 2 |
| return traceback.StackSummary.extract( |
| traceback.walk_stack(None), capture_locals=True, limit=1) |
| s = some_inner(3, 4) |
| self.assertEqual( |
| [' File "%s", line %d, in some_inner\n' |
| ' return traceback.StackSummary.extract(\n' |
| ' a = 1\n' |
| ' b = 2\n' |
| ' k = 3\n' |
| ' v = 4\n' % (__file__, some_inner.__code__.co_firstlineno + 3) |
| ], s.format()) |
| |
| class TestTracebackException(unittest.TestCase): |
| |
| def test_smoke(self): |
| try: |
| 1/0 |
| except Exception: |
| exc_info = sys.exc_info() |
| exc = traceback.TracebackException(*exc_info) |
| expected_stack = traceback.StackSummary.extract( |
| traceback.walk_tb(exc_info[2])) |
| self.assertEqual(None, exc.__cause__) |
| self.assertEqual(None, exc.__context__) |
| self.assertEqual(False, exc.__suppress_context__) |
| self.assertEqual(expected_stack, exc.stack) |
| self.assertEqual(exc_info[0], exc.exc_type) |
| self.assertEqual(str(exc_info[1]), str(exc)) |
| |
| def test_from_exception(self): |
| # Check all the parameters are accepted. |
| def foo(): |
| 1/0 |
| try: |
| foo() |
| except Exception as e: |
| exc_info = sys.exc_info() |
| self.expected_stack = traceback.StackSummary.extract( |
| traceback.walk_tb(exc_info[2]), limit=1, lookup_lines=False, |
| capture_locals=True) |
| self.exc = traceback.TracebackException.from_exception( |
| e, limit=1, lookup_lines=False, capture_locals=True) |
| expected_stack = self.expected_stack |
| exc = self.exc |
| self.assertEqual(None, exc.__cause__) |
| self.assertEqual(None, exc.__context__) |
| self.assertEqual(False, exc.__suppress_context__) |
| self.assertEqual(expected_stack, exc.stack) |
| self.assertEqual(exc_info[0], exc.exc_type) |
| self.assertEqual(str(exc_info[1]), str(exc)) |
| |
| def test_cause(self): |
| try: |
| try: |
| 1/0 |
| finally: |
| exc_info_context = sys.exc_info() |
| exc_context = traceback.TracebackException(*exc_info_context) |
| cause = Exception("cause") |
| raise Exception("uh oh") from cause |
| except Exception: |
| exc_info = sys.exc_info() |
| exc = traceback.TracebackException(*exc_info) |
| expected_stack = traceback.StackSummary.extract( |
| traceback.walk_tb(exc_info[2])) |
| exc_cause = traceback.TracebackException(Exception, cause, None) |
| self.assertEqual(exc_cause, exc.__cause__) |
| self.assertEqual(exc_context, exc.__context__) |
| self.assertEqual(True, exc.__suppress_context__) |
| self.assertEqual(expected_stack, exc.stack) |
| self.assertEqual(exc_info[0], exc.exc_type) |
| self.assertEqual(str(exc_info[1]), str(exc)) |
| |
| def test_context(self): |
| try: |
| try: |
| 1/0 |
| finally: |
| exc_info_context = sys.exc_info() |
| exc_context = traceback.TracebackException(*exc_info_context) |
| raise Exception("uh oh") |
| except Exception: |
| exc_info = sys.exc_info() |
| exc = traceback.TracebackException(*exc_info) |
| expected_stack = traceback.StackSummary.extract( |
| traceback.walk_tb(exc_info[2])) |
| self.assertEqual(None, exc.__cause__) |
| self.assertEqual(exc_context, exc.__context__) |
| self.assertEqual(False, exc.__suppress_context__) |
| self.assertEqual(expected_stack, exc.stack) |
| self.assertEqual(exc_info[0], exc.exc_type) |
| self.assertEqual(str(exc_info[1]), str(exc)) |
| |
| def test_comparison(self): |
| try: |
| 1/0 |
| except Exception: |
| exc_info = sys.exc_info() |
| exc = traceback.TracebackException(*exc_info) |
| exc2 = traceback.TracebackException(*exc_info) |
| self.assertIsNot(exc, exc2) |
| self.assertEqual(exc, exc2) |
| self.assertNotEqual(exc, object()) |
| self.assertEqual(exc, ALWAYS_EQ) |
| |
| def test_unhashable(self): |
| class UnhashableException(Exception): |
| def __eq__(self, other): |
| return True |
| |
| ex1 = UnhashableException('ex1') |
| ex2 = UnhashableException('ex2') |
| try: |
| raise ex2 from ex1 |
| except UnhashableException: |
| try: |
| raise ex1 |
| except UnhashableException: |
| exc_info = sys.exc_info() |
| exc = traceback.TracebackException(*exc_info) |
| formatted = list(exc.format()) |
| self.assertIn('UnhashableException: ex2\n', formatted[2]) |
| self.assertIn('UnhashableException: ex1\n', formatted[6]) |
| |
| def test_limit(self): |
| def recurse(n): |
| if n: |
| recurse(n-1) |
| else: |
| 1/0 |
| try: |
| recurse(10) |
| except Exception: |
| exc_info = sys.exc_info() |
| exc = traceback.TracebackException(*exc_info, limit=5) |
| expected_stack = traceback.StackSummary.extract( |
| traceback.walk_tb(exc_info[2]), limit=5) |
| self.assertEqual(expected_stack, exc.stack) |
| |
| def test_lookup_lines(self): |
| linecache.clearcache() |
| e = Exception("uh oh") |
| c = test_code('/foo.py', 'method') |
| f = test_frame(c, None, None) |
| tb = test_tb(f, 6, None) |
| exc = traceback.TracebackException(Exception, e, tb, lookup_lines=False) |
| self.assertEqual({}, linecache.cache) |
| linecache.updatecache('/foo.py', globals()) |
| self.assertEqual(exc.stack[0].line, "import sys") |
| |
| def test_locals(self): |
| linecache.updatecache('/foo.py', globals()) |
| e = Exception("uh oh") |
| c = test_code('/foo.py', 'method') |
| f = test_frame(c, globals(), {'something': 1, 'other': 'string'}) |
| tb = test_tb(f, 6, None) |
| exc = traceback.TracebackException( |
| Exception, e, tb, capture_locals=True) |
| self.assertEqual( |
| exc.stack[0].locals, {'something': '1', 'other': "'string'"}) |
| |
| def test_no_locals(self): |
| linecache.updatecache('/foo.py', globals()) |
| e = Exception("uh oh") |
| c = test_code('/foo.py', 'method') |
| f = test_frame(c, globals(), {'something': 1}) |
| tb = test_tb(f, 6, None) |
| exc = traceback.TracebackException(Exception, e, tb) |
| self.assertEqual(exc.stack[0].locals, None) |
| |
| def test_traceback_header(self): |
| # do not print a traceback header if exc_traceback is None |
| # see issue #24695 |
| exc = traceback.TracebackException(Exception, Exception("haven"), None) |
| self.assertEqual(list(exc.format()), ["Exception: haven\n"]) |
| |
| |
| class MiscTest(unittest.TestCase): |
| |
| def test_all(self): |
| expected = set() |
| denylist = {'print_list'} |
| for name in dir(traceback): |
| if name.startswith('_') or name in denylist: |
| continue |
| module_object = getattr(traceback, name) |
| if getattr(module_object, '__module__', None) == 'traceback': |
| expected.add(name) |
| self.assertCountEqual(traceback.__all__, expected) |
| |
| |
| if __name__ == "__main__": |
| unittest.main() |
