I run

lean init

in PowerShell and I can see
-------------
lean : The term 'lean' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included,
verify that the path is correct and try again.
At line:1 char:1
+ lean init
+ ~~~~
   + CategoryInfo          : ObjectNotFound: (lean:String) [], CommandNotFoundException
   + FullyQualifiedErrorId : CommandNotFoundException
------------------
 

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The installation of the Docker and the lean

pip install lean

was successful. 
Notwithstanding the installation was successful,

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there is no lean command in Windows. 

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The question is:
Why the Windows does not familiar with the “lean” command?