[ python-Bugs-1680159 ] Misleading exception from unicode.__contains__

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Bugs item #1680159, was opened at 2007-03-13 21:33
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Category: Unicode
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Jan Hudec (bulbjh)
Assigned to: M.-A. Lemburg (lemburg)
Summary: Misleading exception from unicode.__contains__

Initial Comment:
Hello Folks,

unicode.__contains__ throws:

>>> '\xff' in u'foo'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'in <string>' requires string as left operand

while:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'ascii' codec can't decode byte 0xff in position 0: ordinal not in range(128)

would be more helpful, because that's what really fails there. The exception it throws now does not indicate that unicode is involved.

(tried this with 2.4.4 and 2.5.0 and happens in both)

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