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Issue #20879: Delay the initialization of encoding and decoding tables for

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base32, ascii85 and base85 codecs in the base64 module, and delay the
initialization of the unquote_to_bytes() table of the urllib.parse module, to
not waste memory if these modules are not used.
This commit is contained in:
Victor Stinner 2014-03-17 22:38:41 +01:00
parent 2a6053468e
commit d6a91a7ab6
3 changed files with 54 additions and 19 deletions
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9
Lib/urllib/parse.py
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@ -472,8 +472,7 @@ def urldefrag(url):
return _coerce_result(DefragResult(defrag, frag))
_hexdig = '0123456789ABCDEFabcdef'
_hextobyte = {(a + b).encode(): bytes([int(a + b, 16)])
for a in _hexdig for b in _hexdig}
_hextobyte = None
def unquote_to_bytes(string):
"""unquote_to_bytes('abc%20def') -> b'abc def'."""
@ -490,6 +489,12 @@ def unquote_to_bytes(string):
return string
res = [bits[0]]
append = res.append
# Delay the initialization of the table to not waste memory
# if the function is never called
global _hextobyte
if _hextobyte is None:
_hextobyte = {(a + b).encode(): bytes([int(a + b, 16)])
for a in _hexdig for b in _hexdig}
for item in bits[1:]:
try:
append(_hextobyte[item[:2]])