GSAS-II with Python 3.x

Here are some instructions for installing Python 3.6 for GSAS-II

Windows

Install Miniconda from ​https://repo.continuum.io/miniconda

• Download and run the ​Miniconda3-latest-Windows-x86_64.exe file. The installer will ask you to exit all applications. This is probably not needed but saving your work in all apps before continuing seems like a good idea.

• You will need to accept the license agreement.

• Select "Just Me" unless you want to run Python from multiple accounts on your computer and are logged into an admin account. Use of "Just Me" is recommended.

• Select the installation location with some care. Avoid any path that contains a space in it (avoid C:\Users\Brian Toby\Miniconda3). I suggest C:\conda3. Make a note of the path you use and change subsequent commands to use this path if you use something else.

• Unselect both of the two "Advanced option" boxes unless you are planning to do your own development in Python and understand what they do.

• Click on "Install" and wait a few minutes while the minimal Python files are unpacked and are installed on your computer.

• On the Thanks page, you may want to unselect the two boxes, but do note that the Anaconda folks are doing a great service for science.

Start a Command window

In the start menu, look for an Anaconda3 Windows menu item and select the "Anaconda Prompt" item.

• This will start a cmd.exe window where Python and other Anaconda-installed tools are in the path.

• If for some reason this command is not available. Do this:

• Open a "Command Prompt" window and type c:\conda3\Scripts\activate into that window to set up the Anaconda environment.

Update the Python installation

Type this command:

conda update --all

• you will be given a list of packages that have been updated since the miniconda file was created, press enter at the Proceed prompt to perform the update. This may take a few minutes.

Add other needed packages

Type this command:

conda install matplotlib pillow pyopengl scipy svn h5py pywin32

• You will be given a list of packages to be downloaded and installed, press enter at the Proceed prompt to perform the install. This will take at least a few minutes.

Install the wxPython package =

Type this command:

pip install wxpython

• a 23 Mb file is downloaded and installed. This usually takes less than a minute.

Install GSAS-II

• Download a script to install GSAS-II from this location:

​​https://subversion.xray.aps.anl.gov/trac/pyGSAS/browser/install/bootstrap.py?format=txt