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From: John Nagle on 8 Aug 2010 13:55
This warning appeared from urllib.quote:

"/usr/local/lib/python2.6/urllib.py:1222: UnicodeWarning: Unicode equal
comparison failed to convert both arguments to Unicode - interpreting
them as being unequal res = map(safe_map.__getitem__, s) "

Here's urllib.quote from Python 2.6:

====

def quote(s, safe = '/'):
"""quote('abc def') -> 'abc%20def'

Each part of a URL, e.g. the path info, the query, etc., has a
different set of reserved characters that must be quoted.

RFC 2396 Uniform Resource Identifiers (URI): Generic Syntax lists
the following reserved characters.

reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |
"$" | ","

Each of these characters is reserved in some component of a URL,
but not necessarily in all of them.

By default, the quote function is intended for quoting the path
section of a URL. Thus, it will not encode '/'. This character
is reserved, but in typical usage the quote function is being
called on a path where the existing slash characters are used as
reserved characters.
"""
cachekey = (safe, always_safe)
try:
safe_map = _safemaps[cachekey]
except KeyError:
safe += always_safe
safe_map = {}
for i in range(256):
c = chr(i)
safe_map[c] = (c in safe) and c or ('%%%02X' % i)
_safemaps[cachekey] = safe_map
res = map(safe_map.__getitem__, s) #### WARNING REPORTED HERE
return ''.join(res)

=====

I don't, unfortunately, know what went into this call to
produce the message; probably a URL in Unicode.

This looks like code that will do the wrong thing in
Python 2.6 for characters in the range 128-255. Those are
illegal in type "str", but this code is constructing such
values with "chr".

John Nagle

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