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:
rev   line source
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fcfe324663a6 convert shebang lines: python -> python3
Benjamin Peterson <benjamin@python.org>
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1 #! /usr/bin/env python3
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Guido van Rossum <guido@python.org>
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2
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3 # Add some standard cpp magic to a header file
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4
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5 import sys
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6
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7 def main():
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Tim Peters <tim.peters@gmail.com>
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8 args = sys.argv[1:]
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Andrew M. Kuchling <amk@amk.ca>
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9 for filename in args:
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10 process(filename)
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11
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12 def process(filename):
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13 try:
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14 f = open(filename, 'r')
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Guido van Rossum <guido@python.org>
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15 except IOError as msg:
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16 sys.stderr.write('%s: can\'t open: %s\n' % (filename, str(msg)))
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17 return
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18 data = f.read()
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19 f.close()
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Georg Brandl <georg@python.org>
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20 if data[:2] != '/*':
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21 sys.stderr.write('%s does not begin with C comment\n' % filename)
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22 return
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23 try:
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24 f = open(filename, 'w')
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Guido van Rossum <guido@python.org>
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25 except IOError as msg:
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26 sys.stderr.write('%s: can\'t write: %s\n' % (filename, str(msg)))
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27 return
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28 sys.stderr.write('Processing %s ...\n' % filename)
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29 magic = 'Py_'
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30 for c in filename:
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31 if ord(c)<=0x80 and c.isalnum():
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32 magic = magic + c.upper()
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33 else: magic = magic + '_'
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34 sys.stdout = f
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35 print('#ifndef', magic)
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36 print('#define', magic)
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37 print('#ifdef __cplusplus')
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38 print('extern "C" {')
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39 print('#endif')
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40 print()
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41 f.write(data)
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42 print()
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43 print('#ifdef __cplusplus')
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44 print('}')
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45 print('#endif')
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46 print('#endif /*', '!'+magic, '*/')
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47
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Andrew M. Kuchling <amk@amk.ca>
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48 if __name__ == '__main__':
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49 main()