Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/byteyears.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:
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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2
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3 # Print the product of age and size of each file, in suitable units.
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4 #
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5 # Usage: byteyears [ -a | -m | -c ] file ...
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6 #
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7 # Options -[amc] select atime, mtime (default) or ctime as age.
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8
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9 import sys, os, time
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10 from stat import *
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11
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12 def main():
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13
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14 # Use lstat() to stat files if it exists, else stat()
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15 try:
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16 statfunc = os.lstat
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17 except AttributeError:
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18 statfunc = os.stat
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19
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20 # Parse options
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21 if sys.argv[1] == '-m':
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22 itime = ST_MTIME
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23 del sys.argv[1]
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24 elif sys.argv[1] == '-c':
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25 itime = ST_CTIME
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26 del sys.argv[1]
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27 elif sys.argv[1] == '-a':
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28 itime = ST_CTIME
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29 del sys.argv[1]
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30 else:
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31 itime = ST_MTIME
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32
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33 secs_per_year = 365.0 * 24.0 * 3600.0 # Scale factor
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34 now = time.time() # Current time, for age computations
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35 status = 0 # Exit status, set to 1 on errors
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37 # Compute max file name length
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38 maxlen = 1
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39 for filename in sys.argv[1:]:
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40 maxlen = max(maxlen, len(filename))
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42 # Process each argument in turn
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43 for filename in sys.argv[1:]:
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44 try:
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45 st = statfunc(filename)
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46 except OSError as msg:
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47 sys.stderr.write("can't stat %r: %r\n" % (filename, msg))
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48 status = 1
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49 st = ()
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50 if st:
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51 anytime = st[itime]
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52 size = st[ST_SIZE]
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53 age = now - anytime
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54 byteyears = float(size) * float(age) / secs_per_year
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55 print(filename.ljust(maxlen), end=' ')
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56 print(repr(int(byteyears)).rjust(8))
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57
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58 sys.exit(status)
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59
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60 if __name__ == '__main__':
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61 main()