Hi,
> > Thanks for reply. Actually I installed python 3.6 and can do python > programming on my PC. > > image.png > > Do you have any idea about this? > Probably Python is not in your PATH. Did you exactly follow the instructions on the Kwant website? It seems that step 4 here:https://kwant-project.org/install#microsoft-windows should add Python to your PATH so that you can type 'python'. rather than 'C:\Python36\python.exe' every time. In any case this problem is with your Python installation, and is not specific to Kwant. Happy Kwanting, Joe
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