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//usr/lib/python2.4/lib-old/addpack.py
# This module provides standard support for "packages". # # The idea is that large groups of related modules can be placed in # their own subdirectory, which can be added to the Python search path # in a relatively easy way. # # The current version takes a package name and searches the Python # search path for a directory by that name, and if found adds it to # the module search path (sys.path). It maintains a list of packages # that have already been added so adding the same package many times # is OK. # # It is intended to be used in a fairly stylized manner: each module # that wants to use a particular package, say 'Foo', is supposed to # contain the following code: # # from addpack import addpack # addpack('Foo') # <import modules from package Foo> # # Additional arguments, when present, provide additional places where # to look for the package before trying sys.path (these may be either # strings or lists/tuples of strings). Also, if the package name is a # full pathname, first the last component is tried in the usual way, # then the full pathname is tried last. If the package name is a # *relative* pathname (UNIX: contains a slash but doesn't start with # one), then nothing special is done. The packages "/foo/bar/bletch" # and "bletch" are considered the same, but unrelated to "bar/bletch". # # If the algorithm finds more than one suitable subdirectory, all are # added to the search path -- this makes it possible to override part # of a package. The same path will not be added more than once. # # If no directory is found, ImportError is raised. _packs = {} # {pack: [pathname, ...], ...} def addpack(pack, *locations): import os if os.path.isabs(pack): base = os.path.basename(pack) else: base = pack if _packs.has_key(base): return import sys path = [] for loc in _flatten(locations) + sys.path: fn = os.path.join(loc, base) if fn not in path and os.path.isdir(fn): path.append(fn) if pack != base and pack not in path and os.path.isdir(pack): path.append(pack) if not path: raise ImportError, 'package ' + pack + ' not found' _packs[base] = path for fn in path: if fn not in sys.path: sys.path.append(fn) def _flatten(locations): locs = [] for loc in locations: if type(loc) == type(''): locs.append(loc) else: locs = locs + _flatten(loc) return locs