urllib "quote" problem

John Nagle nagle at animats.com
Sun Aug 8 19:55:02 CEST 2010


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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