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Lib/ctypes/test/test_macholib.py
import os
import sys
import unittest

# Bob Ippolito:
"""
Ok.. the code to find the filename for __getattr__ should look
something like:

import os
from macholib.dyld import dyld_find

def find_lib(name):
     possible = ['lib'+name+'.dylib', name+'.dylib',
     name+'.framework/'+name]
     for dylib in possible:
         try:
             return os.path.realpath(dyld_find(dylib))
         except ValueError:
             pass
     raise ValueError, "%s not found" % (name,)

It'll have output like this:

 >>> find_lib('pthread')
'/usr/lib/libSystem.B.dylib'
 >>> find_lib('z')
'/usr/lib/libz.1.dylib'
 >>> find_lib('IOKit')
'/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit'

-bob

"""

from ctypes.macholib.dyld import dyld_find

def find_lib(name):
    possible = ['lib'+name+'.dylib', name+'.dylib', name+'.framework/'+name]
    for dylib in possible:
        try:
            return os.path.realpath(dyld_find(dylib))
        except ValueError:
            pass
    raise ValueError("%s not found" % (name,))

class MachOTest(unittest.TestCase):
    @unittest.skipUnless(sys.platform == "darwin", 'OSX-specific test')
    def test_find(self):

        self.assertEqual(find_lib('pthread'),
                             '/usr/lib/libSystem.B.dylib')

        result = find_lib('z')
        # Issue #21093: dyld default search path includes $HOME/lib and
        # /usr/local/lib before /usr/lib, which caused test failures if
        # a local copy of libz exists in one of them. Now ignore the head
        # of the path.
        self.assertRegexpMatches(result, r".*/lib/libz\..*.*\.dylib")

        self.assertEqual(find_lib('IOKit'),
                             '/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit')

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