Mercurial > cpython-lru_cache-weakref

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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 fcfe324663a6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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fcfe324663a6 convert shebang lines: python -> python3
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1 #! /usr/bin/env python3
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2
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3 # mkreal
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4 #
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5 # turn a symlink to a directory into a real directory
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6
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7 import sys
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8 import os
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9 from stat import *
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10
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11 join = os.path.join
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12
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13 error = 'mkreal error'
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14
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15 BUFSIZE = 32*1024
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16
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17 def mkrealfile(name):
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18 st = os.stat(name) # Get the mode
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19 mode = S_IMODE(st[ST_MODE])
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20 linkto = os.readlink(name) # Make sure again it's a symlink
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21 f_in = open(name, 'r') # This ensures it's a file
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22 os.unlink(name)
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23 f_out = open(name, 'w')
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24 while 1:
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25 buf = f_in.read(BUFSIZE)
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26 if not buf: break
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27 f_out.write(buf)
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28 del f_out # Flush data to disk before changing mode
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29 os.chmod(name, mode)
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30
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31 def mkrealdir(name):
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32 st = os.stat(name) # Get the mode
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33 mode = S_IMODE(st[ST_MODE])
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34 linkto = os.readlink(name)
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35 files = os.listdir(name)
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36 os.unlink(name)
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37 os.mkdir(name, mode)
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38 os.chmod(name, mode)
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39 linkto = join(os.pardir, linkto)
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40 #
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41 for filename in files:
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42 if filename not in (os.curdir, os.pardir):
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43 os.symlink(join(linkto, filename), join(name, filename))
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44
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45 def main():
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46 sys.stdout = sys.stderr
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47 progname = os.path.basename(sys.argv[0])
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48 if progname == '-c': progname = 'mkreal'
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49 args = sys.argv[1:]
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50 if not args:
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51 print('usage:', progname, 'path ...')
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52 sys.exit(2)
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53 status = 0
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54 for name in args:
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55 if not os.path.islink(name):
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56 print(progname+':', name+':', 'not a symlink')
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57 status = 1
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58 else:
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59 if os.path.isdir(name):
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60 mkrealdir(name)
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61 else:
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62 mkrealfile(name)
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63 sys.exit(status)
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64
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65 if __name__ == '__main__':
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66 main()