STINNER Victor <[email protected]> added the comment:
You may try:
$ ./python
>>> import ctypes
>>> import ctypes.util
>>> libc = ctypes.cdll.LoadLibrary(ctypes.util.find_library('c'))
>>> isinf = libc.isinf
>>> isinf.argtypes = (ctypes.c_double,)
>>> isinf(0.0)
0
>>> isinf(float('inf'))
1
(try ctypes.util.find_library('m') if isinf is not in libc)
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<http://bugs.python.org/issue12589>
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