D'Arcy Cain wrote: > On 2018-07-12 07:41 PM, Peter Otten wrote: >> Wild guess: one Python is 64 bit and the other is 32 bit, and you have >> only one version of the library installed. > > Nope. Both are 64 bit.
Just to be 100% sure, what does $ python2.7 -c 'import struct; print(struct.calcsize("l"))' $ python3.6 -c 'import struct; print(struct.calcsize("l"))' print? If both print 8, what is sys.platform? (This is just that I can look at the right branch of the ctypes.util source for differences)? -- https://mail.python.org/mailman/listinfo/python-list