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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@75077 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
62 lines
2.2 KiB
Python
62 lines
2.2 KiB
Python
'''
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This is used internally by pubsub to allow modules of the pubsub.utils
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subpackage to import modules of a sibbling subpackage (such as
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pubsub.core).
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Value of "up" parameter: For intraImport() the defaut up is 1 because
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it is always used from within an __init__ file ie most likely scenario
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is up=1. The parentImport() function mostly used from within modules
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of a package so up defaults to 2.
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:copyright: Copyright since 2006 by Oliver Schoenborn, all rights reserved.
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:license: BSD, see LICENSE_BSD_Simple.txt for details.
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'''
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# allow utils modules to find sibblings in core
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def intraImport(pathList, up=1):
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'''Enable modules of a subpackage to import modules of a sibbling
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subpackage, or parent modules, ie A.B.C could import A.D.E by doing
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'import D.E' (this is default behavior). If up > 1, can import from
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higher up the import tree. For instance with up=2, ie A.B.C.D could
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import A.E.F.G by doing 'import E.F.G'.
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WARNING: it looks like Python
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loads a separate copy of sibbling modules found via the modified
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module search path; this is a problem if the sibbling modulres
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contain globals (singletons) since more than one instance of a module
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could exist in an application. Use parentImport() in such case.'''
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import os
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newPath = pathList[0]
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for _ in range(0, up):
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newPath = os.path.join(newPath, '..')
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# py2exe requires abspath to find new path
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pathList.append( os.path.abspath( newPath ) )
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_importCache = {}
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def parentImport(modName, up=2):
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'''Import a module modName from parent of current package. Default
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assumes used within a non-init module of pubsub.utils, ie up=2.'''
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# see if in cache
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modObj = _importCache.get( (modName, up), None )
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if modObj is not None:
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return modObj
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# not in cache, assume parent already imported
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module = globals()['__name__'].split('.')
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parentModName = '.'.join( module[:-up] )
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import sys
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parentModObj = sys.modules[parentModName]
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try:
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modObj = getattr(parentModObj, modName)
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_importCache[ (modName, up) ] = modObj
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return modObj
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except AttributeError:
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msg = 'no module named %s in %s' % (modName, parentModName)
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raise ImportError(msg)
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