IDLE editing window no longer works

[chris1]

IDLE editing window no longer works

after installation of Python 3.9 on Windows 10, IDLE worked fine

As PIP was not recognized and I could not install Matplotlib
I installed PIP with
"C:\Users\xxx>py -m pip install SomePackage "
(note that the command " C:\Users\xxx>python -m pip install SomePackage " does not work )

Everything worked normally afterwards, and IDLE too.

But the next day after rebooting the computer, I don't have the command "open with IDLE" anymore, the edit window doesn't appear, only the console appears.

I reinstalled Python and the problem remains (Matplotlib is still present)

None of the possible causes listed in "https://docs.python.org/3/library/idle.html#startupfailure" are affected or correct the problem

here also the command "python -m idlelib" in the console, does not work and returns "python is not found" but the command "py -m idlelib" works fine

Thank you for your help
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[nilamo]

It sounds like python wasn't installed correctly, or at least it wasn't added to your PATH (not being on the PATH is why the shell can't find it). One of the very last steps of the python installer has a checkbox to add it to the path, and I believe that checkbox is not checked by default.

[chris1]

hi nilamo
You are right.... it's weird that the check box is not checked by default
thank you for your help
Chris