On Fri, 12 Mar 2010 06:03:35 am spir wrote:
> Hello,
>
> I need a custom unicode subtype (with additional methods).
[snip]
Here's my second attempt, and a very simple test function that passes.
Obviously you have to add your own additional methods :)
class Unicode(unicode):
"""Unicode(string [, encoding[, errors]]) -> object
Special Unicode class that has all sorts of wonderful
methods missing from the built-in unicode class.
"""
_ENCODING = "utf8"
_ERRORS = "strict"
def __new__(cls, string='', encoding=None, errors=None):
optional_args = not (encoding is errors is None)
# Set default encoding and errors.
if encoding is None: encoding = cls._ENCODING
if errors is None: errors = cls._ERRORS
# To match the behaviour of built-in unicode, if either
# optional argument is specified, we always attempt decoding.
if optional_args or not isinstance(string, unicode):
args = (string, encoding, errors)
else:
args = (string,)
return super(Unicode, cls).__new__(Unicode, *args)
def test():
assert Unicode() == u''
assert Unicode('abcd') == u'abcd'
u = 'cdef'.decode('utf-16')
assert u == u'\u6463\u6665'
s = u.encode('utf-8')
assert Unicode(s) == u
try:
unicode(s)
except UnicodeDecodeError:
pass
else:
assert False, 'failed to fail as expected'
--
Steven D'Aprano
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