Mercurial > cpython-lru_cache-weakref

annotate Lib/test/testcodec.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 0d462d789b18
children
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1 """ Test Codecs (used by test_charmapcodec)
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2
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3 Written by Marc-Andre Lemburg (mal@lemburg.com).
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4
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5 (c) Copyright 2000 Guido van Rossum.
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6
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7 """#"
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8 import codecs
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9
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10 ### Codec APIs
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11
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12 class Codec(codecs.Codec):
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13
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14 def encode(self,input,errors='strict'):
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15
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16 return codecs.charmap_encode(input,errors,encoding_map)
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17
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18 def decode(self,input,errors='strict'):
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19
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20 return codecs.charmap_decode(input,errors,decoding_map)
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21
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22 class StreamWriter(Codec,codecs.StreamWriter):
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23 pass
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24
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25 class StreamReader(Codec,codecs.StreamReader):
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26 pass
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27
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28 ### encodings module API
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29
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30 def getregentry():
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31
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32 return (Codec().encode,Codec().decode,StreamReader,StreamWriter)
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33
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34 ### Decoding Map
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35
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36 decoding_map = codecs.make_identity_dict(range(256))
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37 decoding_map.update({
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38 0x78: "abc", # 1-n decoding mapping
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39 b"abc": 0x0078,# 1-n encoding mapping
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40 0x01: None, # decoding mapping to <undefined>
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41 0x79: "", # decoding mapping to <remove character>
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42 })
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43
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44 ### Encoding Map
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45
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46 encoding_map = {}
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47 for k,v in decoding_map.items():
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48 encoding_map[v] = k