Eryk Sun <eryk...@gmail.com> added the comment:

The _ctypes extension module could have a dict that maps each format code to 
its (size, alignment), based on `formattable`. Then direct size comparisons 
wouldn't be limited to types defined by the struct module, and it wouldn't be 
necessary to create c_longdouble just to check its size and throw it away.

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nosy: +eryksun

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue12142>
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