The Easiest Way to Run Python:https://thonny.org/


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1e) how install package : not installed thonny 
example : numpy (info:path:menu:tools ->open system shell)
2e) see below : how to change directory
3e) how install package : 'pip install numpy', 'see below'
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my system :example
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rem : namecomputer = Chem1 ( <> with your computer:1e)

Some Python commands in the PATH of this session:
 - python    == C:\python\Thonny\python.exe
 - pip       == C:\python\Thonny\Scripts\pip.bat
 - pip3      == C:\python\Thonny\Scripts\pip3.bat
 - pip3.7    == C:\python\Thonny\Scripts\pip3.7.BAT
 - pip3.8    == C:\Python38\Scripts\pip3.8.EXE

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C:\Users\Chem1>cd..

C:\Users>cd..

C:\>cd python
C:\python\Thonny>pip install numpy
C:\python>cd Thonny


Collecting numpy
  Downloading numpy-1.20.1-cp37-cp37m-win32.whl (11.3 MB)
     |████████████████████████████████| 11.3 MB 159 kB/s
Installing collected packages: numpy
Successfully installed numpy-1.20.1
WARNING: You are using pip version 20.1.1; however, version 21.0.1 is available.
You should consider upgrading via the 'C:\python\Thonny\python.exe -m pip install --upgrade pip' command.

C:\python\Thonny>python.exe -m pip install --upgrade pip
Collecting pip
  Using cached pip-21.0.1-py3-none-any.whl (1.5 MB)
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.1.1
    Uninstalling pip-20.1.1:
      Successfully uninstalled pip-20.1.1
Successfully installed pip-21.0.1

C:\python\Thonny>