Mercurial > cpython-lru_cache-weakref

annotate Lib/json/tool.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 69f793cc34fc
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 r"""Command-line tool to validate and pretty-print JSON
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2
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3 Usage::
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4
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5 $ echo '{"json":"obj"}' | python -m json.tool
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6 {
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7 "json": "obj"
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8 }
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9 $ echo '{ 1.2:3.4}' | python -m json.tool
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10 Expecting property name enclosed in double quotes: line 1 column 3 (char 2)
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11
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12 """
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13 import sys
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14 import json
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15
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16 def main():
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17 if len(sys.argv) == 1:
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18 infile = sys.stdin
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19 outfile = sys.stdout
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20 elif len(sys.argv) == 2:
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21 infile = open(sys.argv[1], 'r')
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22 outfile = sys.stdout
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23 elif len(sys.argv) == 3:
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24 infile = open(sys.argv[1], 'r')
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25 outfile = open(sys.argv[2], 'w')
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26 else:
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27 raise SystemExit(sys.argv[0] + " [infile [outfile]]")
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28 with infile:
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29 try:
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30 obj = json.load(infile)
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31 except ValueError as e:
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32 raise SystemExit(e)
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33 with outfile:
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34 json.dump(obj, outfile, sort_keys=True, indent=4)
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35 outfile.write('\n')
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36
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38 if __name__ == '__main__':
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39 main()