How to install pymatgen for Python 2.7.x and not 3.6

Question

The pymatgen module is supposed to work for Python 2.7.x or 3. Files for both are available (https://anaconda.org/matsci/pymatgen/files). My Python (sys.version) is 2.7.11.

I tried installing with standard: "conda install -c mastic pymatgen", but it returns an error:

"Fetching package metadata ...........                                                                       
Solving package specifications: .                                                                           

UnsatisfiableError: The following specifications were found to be in conflict:                              
  - pymatgen -> python 3.6*                                                                                 
  - python 3.5*                                                                                             
Use "conda info <package>" to see the dependencies for each package."

It looks like it is trying to install the pymatgen module for Python 3 and I am a version short.

I want to install the 2.7.x compatible version, but can't find instructions on how to force the conda install to do that.

I can't upgrade to 3.6 for other reasons.

Answer 1

Whatever conda you installed, you can create a specific Python 2.7 environment using

conda create --name py27 python=2.7

You should then be able to follow all the steps for Python 2.7 install.

Answer 2

Have you tried pip ?

But first install NumPy as they mentioned Here

then use : pip install pymatgen

Answer 3

Restarted from running Miniconda3-latest-MacOSX-x86_64.sh, instead of Miniconda2-latest-MacOSX-x86_64.sh.