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annotate Lib/pkgutil.py @ 38664:7619216bbc19 2.4

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Bug #1502728: Correctly link against librt library on HP-UX. (backport from rev. 46743)
author Georg Brandl <georg@python.org>
date Thu, 08 Jun 2006 12:54:16 +0000
parents 7cb6745be525
children ccc0b5412799 f731859e9b3b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Utilities to support packages."""
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2
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3 import os
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4 import sys
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5
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6 def extend_path(path, name):
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7 """Extend a package's path.
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8
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9 Intended use is to place the following code in a package's __init__.py:
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10
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11 from pkgutil import extend_path
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12 __path__ = extend_path(__path__, __name__)
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13
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14 This will add to the package's __path__ all subdirectories of
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15 directories on sys.path named after the package. This is useful
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16 if one wants to distribute different parts of a single logical
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17 package as multiple directories.
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18
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19 It also looks for *.pkg files beginning where * matches the name
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20 argument. This feature is similar to *.pth files (see site.py),
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21 except that it doesn't special-case lines starting with 'import'.
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22 A *.pkg file is trusted at face value: apart from checking for
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23 duplicates, all entries found in a *.pkg file are added to the
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24 path, regardless of whether they are exist the filesystem. (This
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25 is a feature.)
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26
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27 If the input path is not a list (as is the case for frozen
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28 packages) it is returned unchanged. The input path is not
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29 modified; an extended copy is returned. Items are only appended
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30 to the copy at the end.
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31
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32 It is assumed that sys.path is a sequence. Items of sys.path that
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33 are not (unicode or 8-bit) strings referring to existing
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34 directories are ignored. Unicode items of sys.path that cause
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35 errors when used as filenames may cause this function to raise an
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36 exception (in line with os.path.isdir() behavior).
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37 """
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38
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39 if not isinstance(path, list):
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40 # This could happen e.g. when this is called from inside a
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41 # frozen package. Return the path unchanged in that case.
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42 return path
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43
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44 pname = os.path.join(*name.split('.')) # Reconstitute as relative path
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45 # Just in case os.extsep != '.'
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46 sname = os.extsep.join(name.split('.'))
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47 sname_pkg = sname + os.extsep + "pkg"
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48 init_py = "__init__" + os.extsep + "py"
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49
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50 path = path[:] # Start with a copy of the existing path
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51
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52 for dir in sys.path:
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7cb6745be525 SF patch #806246: use basestring where possible
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53 if not isinstance(dir, basestring) or not os.path.isdir(dir):
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54 continue
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55 subdir = os.path.join(dir, pname)
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56 # XXX This may still add duplicate entries to path on
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57 # case-insensitive filesystems
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58 initfile = os.path.join(subdir, init_py)
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59 if subdir not in path and os.path.isfile(initfile):
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60 path.append(subdir)
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61 # XXX Is this the right thing for subpackages like zope.app?
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62 # It looks for a file named "zope.app.pkg"
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63 pkgfile = os.path.join(dir, sname_pkg)
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64 if os.path.isfile(pkgfile):
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65 try:
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66 f = open(pkgfile)
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67 except IOError, msg:
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68 sys.stderr.write("Can't open %s: %s\n" %
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69 (pkgfile, msg))
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70 else:
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71 for line in f:
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72 line = line.rstrip('\n')
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73 if not line or line.startswith('#'):
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74 continue
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75 path.append(line) # Don't check for existence!
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76 f.close()
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77
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78 return path