Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/untabify.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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Benjamin Peterson <benjamin@python.org>
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1 #! /usr/bin/env python3
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b826e50e9573 Utility to untabify stubber results.
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2
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3 "Replace tabs with spaces in argument files. Print names of changed files."
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4
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5 import os
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6 import sys
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7 import getopt
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8 import tokenize
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9
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10 def main():
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11 tabsize = 8
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12 try:
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13 opts, args = getopt.getopt(sys.argv[1:], "t:")
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14 if not args:
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15 raise getopt.error("At least one file argument required")
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16 except getopt.error as msg:
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17 print(msg)
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18 print("usage:", sys.argv[0], "[-t tabwidth] file ...")
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19 return
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20 for optname, optvalue in opts:
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21 if optname == '-t':
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22 tabsize = int(optvalue)
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23
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24 for filename in args:
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25 process(filename, tabsize)
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26
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27
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28 def process(filename, tabsize, verbose=True):
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29 try:
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30 with tokenize.open(filename) as f:
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31 text = f.read()
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32 encoding = f.encoding
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33 except IOError as msg:
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34 print("%r: I/O error: %s" % (filename, msg))
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35 return
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36 newtext = text.expandtabs(tabsize)
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37 if newtext == text:
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38 return
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39 backup = filename + "~"
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40 try:
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41 os.unlink(backup)
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42 except OSError:
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43 pass
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44 try:
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45 os.rename(filename, backup)
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46 except OSError:
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47 pass
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48 with open(filename, "w", encoding=encoding) as f:
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49 f.write(newtext)
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50 if verbose:
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51 print(filename)
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52
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53
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54 if __name__ == '__main__':
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55 main()