Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/byteyears.py @ 31175:5cc1a400a02c legacy-trunk

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Use dictionary specific looping idiom where possible. Simplifies and speeds-up the code.
author Raymond Hettinger <python@rcn.com>
date Sat, 13 Dec 2003 14:46:46 +0000
parents 93c92f20b6bf
children 71a294bd7950
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #! /usr/bin/env python
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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 # Use lstat() to stat files if it exists, else stat()
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13 try:
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14 statfunc = os.lstat
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15 except AttributeError:
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16 statfunc = os.stat
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18 # Parse options
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19 if sys.argv[1] == '-m':
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20 itime = ST_MTIME
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21 del sys.argv[1]
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22 elif sys.argv[1] == '-c':
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23 itime = ST_CTIME
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24 del sys.argv[1]
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25 elif sys.argv[1] == '-a':
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26 itime = ST_CTIME
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27 del sys.argv[1]
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28 else:
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29 itime = ST_MTIME
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30
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31 secs_per_year = 365.0 * 24.0 * 3600.0 # Scale factor
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32 now = time.time() # Current time, for age computations
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33 status = 0 # Exit status, set to 1 on errors
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34
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35 # Compute max file name length
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36 maxlen = 1
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37 for filename in sys.argv[1:]:
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38 maxlen = max(maxlen, len(filename))
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39
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40 # Process each argument in turn
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41 for filename in sys.argv[1:]:
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42 try:
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43 st = statfunc(filename)
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44 except os.error, msg:
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45 sys.stderr.write('can\'t stat ' + `filename` + ': ' + `msg` + '\n')
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46 status = 1
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47 st = ()
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48 if st:
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49 anytime = st[itime]
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50 size = st[ST_SIZE]
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51 age = now - anytime
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52 byteyears = float(size) * float(age) / secs_per_year
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53 print filename.ljust(maxlen),
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54 print repr(int(byteyears)).rjust(8)
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56 sys.exit(status)