Mercurial > cpython-lru_cache-weakref

annotate Lib/lib-old/addpack.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 91f846f6d6a6
children c3a096bfbd6b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # This module provides standard support for "packages".
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2 #
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3 # The idea is that large groups of related modules can be placed in
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4 # their own subdirectory, which can be added to the Python search path
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5 # in a relatively easy way.
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6 #
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7 # The current version takes a package name and searches the Python
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8 # search path for a directory by that name, and if found adds it to
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9 # the module search path (sys.path). It maintains a list of packages
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10 # that have already been added so adding the same package many times
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11 # is OK.
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12 #
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13 # It is intended to be used in a fairly stylized manner: each module
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14 # that wants to use a particular package, say 'Foo', is supposed to
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15 # contain the following code:
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16 #
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17 # from addpack import addpack
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18 # addpack('Foo')
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19 # <import modules from package Foo>
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20 #
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21 # Additional arguments, when present, provide additional places where
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22 # to look for the package before trying sys.path (these may be either
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23 # strings or lists/tuples of strings). Also, if the package name is a
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24 # full pathname, first the last component is tried in the usual way,
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25 # then the full pathname is tried last. If the package name is a
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26 # *relative* pathname (UNIX: contains a slash but doesn't start with
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27 # one), then nothing special is done. The packages "/foo/bar/bletch"
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28 # and "bletch" are considered the same, but unrelated to "bar/bletch".
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29 #
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30 # If the algorithm finds more than one suitable subdirectory, all are
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31 # added to the search path -- this makes it possible to override part
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32 # of a package. The same path will not be added more than once.
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33 #
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34 # If no directory is found, ImportError is raised.
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35
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36 _packs = {} # {pack: [pathname, ...], ...}
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37
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38 def addpack(pack, *locations):
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39 import os
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40 if os.path.isabs(pack):
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41 base = os.path.basename(pack)
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42 else:
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43 base = pack
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44 if _packs.has_key(base):
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45 return
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46 import sys
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47 path = []
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48 for loc in _flatten(locations) + sys.path:
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49 fn = os.path.join(loc, base)
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50 if fn not in path and os.path.isdir(fn):
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51 path.append(fn)
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52 if pack != base and pack not in path and os.path.isdir(pack):
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53 path.append(pack)
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54 if not path: raise ImportError, 'package ' + pack + ' not found'
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55 _packs[base] = path
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56 for fn in path:
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57 if fn not in sys.path:
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58 sys.path.append(fn)
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59
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60 def _flatten(locations):
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61 locs = []
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62 for loc in locations:
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63 if type(loc) == type(''):
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64 locs.append(loc)
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65 else:
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66 locs = locs + _flatten(loc)
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67 return locs