"""Backport of importlib.import_module from 3.x.""" | |
# While not critical (and in no way guaranteed!), it would be nice to keep this | |
# code compatible with Python 2.3. | |
import sys | |
def _resolve_name(name, package, level): | |
"""Return the absolute name of the module to be imported.""" | |
if not hasattr(package, 'rindex'): | |
raise ValueError("'package' not set to a string") | |
dot = len(package) | |
for x in xrange(level, 1, -1): | |
try: | |
dot = package.rindex('.', 0, dot) | |
except ValueError: | |
raise ValueError("attempted relative import beyond top-level " | |
"package") | |
return "%s.%s" % (package[:dot], name) | |
def import_module(name, package=None): | |
"""Import a module. | |
The 'package' argument is required when performing a relative import. It | |
specifies the package to use as the anchor point from which to resolve the | |
relative import to an absolute import. | |
""" | |
if name.startswith('.'): | |
if not package: | |
raise TypeError("relative imports require the 'package' argument") | |
level = 0 | |
for character in name: | |
if character != '.': | |
break | |
level += 1 | |
name = _resolve_name(name[level:], package, level) | |
__import__(name) | |
return sys.modules[name] |