Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/linktree.py @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents 6cfe2982de42
children
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1 #! /usr/bin/env python3
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2
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3 # linktree
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4 #
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5 # Make a copy of a directory tree with symbolic links to all files in the
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6 # original tree.
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7 # All symbolic links go to a special symbolic link at the top, so you
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8 # can easily fix things if the original source tree moves.
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9 # See also "mkreal".
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10 #
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11 # usage: mklinks oldtree newtree
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12
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13 import sys, os
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14
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15 LINK = '.LINK' # Name of special symlink at the top.
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16
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17 debug = 0
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18
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19 def main():
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20 if not 3 <= len(sys.argv) <= 4:
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21 print('usage:', sys.argv[0], 'oldtree newtree [linkto]')
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22 return 2
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23 oldtree, newtree = sys.argv[1], sys.argv[2]
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24 if len(sys.argv) > 3:
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25 link = sys.argv[3]
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26 link_may_fail = 1
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27 else:
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28 link = LINK
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29 link_may_fail = 0
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30 if not os.path.isdir(oldtree):
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31 print(oldtree + ': not a directory')
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32 return 1
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33 try:
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34 os.mkdir(newtree, 0o777)
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35 except OSError as msg:
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36 print(newtree + ': cannot mkdir:', msg)
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37 return 1
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38 linkname = os.path.join(newtree, link)
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39 try:
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40 os.symlink(os.path.join(os.pardir, oldtree), linkname)
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41 except OSError as msg:
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42 if not link_may_fail:
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43 print(linkname + ': cannot symlink:', msg)
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44 return 1
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45 else:
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46 print(linkname + ': warning: cannot symlink:', msg)
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47 linknames(oldtree, newtree, link)
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48 return 0
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49
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50 def linknames(old, new, link):
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51 if debug: print('linknames', (old, new, link))
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52 try:
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53 names = os.listdir(old)
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54 except OSError as msg:
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55 print(old + ': warning: cannot listdir:', msg)
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56 return
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57 for name in names:
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58 if name not in (os.curdir, os.pardir):
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59 oldname = os.path.join(old, name)
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60 linkname = os.path.join(link, name)
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61 newname = os.path.join(new, name)
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62 if debug > 1: print(oldname, newname, linkname)
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63 if os.path.isdir(oldname) and \
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64 not os.path.islink(oldname):
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65 try:
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66 os.mkdir(newname, 0o777)
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67 ok = 1
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68 except:
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69 print(newname + \
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70 ': warning: cannot mkdir:', msg)
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71 ok = 0
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72 if ok:
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73 linkname = os.path.join(os.pardir,
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74 linkname)
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75 linknames(oldname, newname, linkname)
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76 else:
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77 os.symlink(linkname, newname)
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78
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79 if __name__ == '__main__':
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80 sys.exit(main())