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 0feb63490093
children
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1 """Terminal utilities."""
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2
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3 # Author: Steen Lumholt.
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4
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5 from termios import *
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7 __all__ = ["setraw", "setcbreak"]
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9 # Indexes for termios list.
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10 IFLAG = 0
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11 OFLAG = 1
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12 CFLAG = 2
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13 LFLAG = 3
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14 ISPEED = 4
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15 OSPEED = 5
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16 CC = 6
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17
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18 def setraw(fd, when=TCSAFLUSH):
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19 """Put terminal into a raw mode."""
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20 mode = tcgetattr(fd)
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21 mode[IFLAG] = mode[IFLAG] & ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON)
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22 mode[OFLAG] = mode[OFLAG] & ~(OPOST)
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23 mode[CFLAG] = mode[CFLAG] & ~(CSIZE | PARENB)
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24 mode[CFLAG] = mode[CFLAG] | CS8
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25 mode[LFLAG] = mode[LFLAG] & ~(ECHO | ICANON | IEXTEN | ISIG)
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26 mode[CC][VMIN] = 1
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27 mode[CC][VTIME] = 0
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28 tcsetattr(fd, when, mode)
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29
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30 def setcbreak(fd, when=TCSAFLUSH):
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31 """Put terminal into a cbreak mode."""
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32 mode = tcgetattr(fd)
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33 mode[LFLAG] = mode[LFLAG] & ~(ECHO | ICANON)
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34 mode[CC][VMIN] = 1
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35 mode[CC][VTIME] = 0
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36 tcsetattr(fd, when, mode)