Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/import_diagnostics.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 00221c8b7c86
children
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1 #!/usr/bin/env python3
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2 """Miscellaneous diagnostics for the import system"""
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3
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4 import sys
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5 import argparse
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6 from pprint import pprint
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7
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8 def _dump_state(args):
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9 print(sys.version)
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10 for name in args.attributes:
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11 print("sys.{}:".format(name))
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12 pprint(getattr(sys, name))
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13
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14 def _add_dump_args(cmd):
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15 cmd.add_argument("attributes", metavar="ATTR", nargs="+",
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16 help="sys module attribute to display")
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17
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18 COMMANDS = (
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19 ("dump", "Dump import state", _dump_state, _add_dump_args),
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20 )
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21
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22 def _make_parser():
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23 parser = argparse.ArgumentParser()
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24 sub = parser.add_subparsers(title="Commands")
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25 for name, description, implementation, add_args in COMMANDS:
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26 cmd = sub.add_parser(name, help=description)
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27 cmd.set_defaults(command=implementation)
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28 add_args(cmd)
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29 return parser
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30
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31 def main(args):
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32 parser = _make_parser()
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33 args = parser.parse_args(args)
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34 return args.command(args)
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35
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36 if __name__ == "__main__":
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37 sys.exit(main(sys.argv[1:]))