[Python-Dev] unicode hell/mixing str and unicode as dictionary keys (original) (raw)

Ralf Schmitt ralf at brainbot.com
Fri Aug 4 11🔞28 CEST 2006

Jean-Paul Calderone wrote:

I like the exception that 2.5 raises. I only wish it raised by default when using 'ascii' and u'ascii' as keys in the same dictionary. ;) Oh, and that str and unicode did not hash like they do. ;)

No problem:

import sys reload(sys) <module 'sys' (built-in)> sys.setdefaultencoding("base64") "a"==u"a" Traceback (most recent call last): File "", line 1, in File "/exp/lib/python2.5/encodings/base64_codec.py", line 42, in base64_decode output = base64.decodestring(input) File "/exp/lib/python2.5/base64.py", line 321, in decodestring return binascii.a2b_base64(s) binascii.Error: Incorrect padding "a"=="a" True d={u"a":1, "a":1} Traceback (most recent call last): File "", line 1, in File "/exp/lib/python2.5/encodings/base64_codec.py", line 42, in base64_decode output = base64.decodestring(input) File "/exp/lib/python2.5/base64.py", line 321, in decodestring return binascii.a2b_base64(s) binascii.Error: Incorrect padding

Maybe this is all just a matter of choosing the right defaultencoding ? :)

BTW, python 2.4 also suppresses this exception (when instantiating the dictionary)

Does python 2.4 catch any exception when comparing keys (which are not basestrings) in dictionaries?

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