Mercurial > cpython-lru_cache-weakref

annotate Lib/importlib/__init__.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 58db4deb7ab1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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b4ace2b6c28f Backport importlib in the form of providing importlib.import_module(). This has
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1 """Backport of importlib.import_module from 3.x."""
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1e7a06a7f5e7 Make importlib backwards-compatible to Python 2.2 (but this is not promised to
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2 # While not critical (and in no way guaranteed!), it would be nice to keep this
1e7a06a7f5e7 Make importlib backwards-compatible to Python 2.2 (but this is not promised to
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3 # code compatible with Python 2.3.
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b4ace2b6c28f Backport importlib in the form of providing importlib.import_module(). This has
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4 import sys
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5
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6 def _resolve_name(name, package, level):
b4ace2b6c28f Backport importlib in the form of providing importlib.import_module(). This has
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7 """Return the absolute name of the module to be imported."""
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8 if not hasattr(package, 'rindex'):
58db4deb7ab1 Fix some more bugs caused by the backport from 3.x for importlib.
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9 raise ValueError("'package' not set to a string")
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10 dot = len(package)
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11 for x in xrange(level, 1, -1):
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12 try:
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13 dot = package.rindex('.', 0, dot)
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parents: 51887
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14 except ValueError:
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b4ace2b6c28f Backport importlib in the form of providing importlib.import_module(). This has
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15 raise ValueError("attempted relative import beyond top-level "
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16 "package")
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17 return "%s.%s" % (package[:dot], name)
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b4ace2b6c28f Backport importlib in the form of providing importlib.import_module(). This has
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18
b4ace2b6c28f Backport importlib in the form of providing importlib.import_module(). This has
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19
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20 def import_module(name, package=None):
b4ace2b6c28f Backport importlib in the form of providing importlib.import_module(). This has
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21 """Import a module.
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22
b4ace2b6c28f Backport importlib in the form of providing importlib.import_module(). This has
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23 The 'package' argument is required when performing a relative import. It
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24 specifies the package to use as the anchor point from which to resolve the
b4ace2b6c28f Backport importlib in the form of providing importlib.import_module(). This has
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25 relative import to an absolute import.
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26
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27 """
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28 if name.startswith('.'):
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29 if not package:
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30 raise TypeError("relative imports require the 'package' argument")
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31 level = 0
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32 for character in name:
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33 if character != '.':
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34 break
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35 level += 1
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36 name = _resolve_name(name[level:], package, level)
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37 __import__(name)
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38 return sys.modules[name]