There may be an error in the installation instructions at http://docs.sympy.org/dev/install.html, which states:I found only one archive, and I found another doc (sorry, can't find its url now) that said to use either python2 or python3 to install. This seems to have worked for me.
"When downloading the archive, make sure to get the correct version (Python 2 or Python 3). If you’re not sure which one to use, you probably want the Python 2 version."
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