| """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] |