[Pyobjc-dev] [ pyobjc-Bugs-681880 ] Conversion to objc string should complain about non-ASCII

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Bugs item #681880, was opened at 2003-02-06 11:42
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=114534&aid=681880&group_id=14534

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: David Eppstein (eppstein)
Assigned to: Nobody/Anonymous (nobody)
Summary: Conversion to objc string should complain about non-ASCII

Initial Comment:
In Python, a str can contain any byte sequence, and has
no specified encoding; to fix an encoding, unicode must
be used instead, and non-ascii strings can not be
converted to unicode without also providing an
encoding.  NSString is like unicode in that an encoding
is known; therefore NSString should be like unicode in
not allowing non-ascii strings to be converted to it
without providing an encoding.

However, in the current version of PyObjC, any string
can be converted to an NSString without complaint. 
This is inconsistent with Python's unicode behavior and
could lead to undetected bugs.

The following test code fails the assertion and
demonstrates the problem.

import unittest
import objc

from Foundation import NSString

class TestEncoding(unittest.TestCase):
    def testEncoding(self):
        try:
            u =
u'\xc3\xbc\xc3\xb1\xc3\xae\xc3\xa7\xc3\xb8d\xc3\xa8'
            s =
NSString.stringWithString_(u.encode('iso-8859-1'))
            self.assertEqual(u,s)
            # unlikely to be equal since stringWithString_
            # has no way of guessing the correct encoding
        except UnicodeError:
            pass
            # should get here, UnicodeError raised
            # when passing non-ascii str to objc

def suite():
    suite = unittest.TestSuite()
    suite.addTest(unittest.makeSuite(TestEncoding))
    return suite

if __name__ == '__main__':
    unittest.main( )


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