I am trying to install python-magic for Windows and I have followed all the instructions in https://github.com/ahupp/python-magic and repeated the process several times but
Installing Cygwin with libmagic libary and installing the most recent version of the module from Github solves this problem.
At the time this question was asked, https://github.com/ahupp/python-magic probably didn't support cygmagic-1.dll.