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'pip' is not recognized as an internal ou external command

ayi

‘pip’ is not recognized as an internal or external command
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Source : <a href="https://technet.microsoft.com/en-us/library/cc755104%28v=ws.11%29.aspx" rel="noopener nofollow ugc">Stack Overflow [windows]</a>,)

ayi_2

Vous devez add the path of your pip installation to your PATH variable système. Par défaut, pip is installed to <code>C:\Python34\Scripts\pip</code> (pip now comes bundled with new versions of python), so the path “C:\Python34\Scripts” needs to be added to your PATH variable.
To check if it is already in your PATH variable, type <code>echo %PATH%</code> at the CMD prompt
To add the path of your pip installation to your PATH variable, vous pouvez utiliser the Panneau de configuration or the <code>setx</code> command. For example:
<pre><code class="lang-auto">setx PATH "%PATH%;C:\Python34\Scripts"

</code></pre>
Note: 
According to the <a href="https://technet.microsoft.com/en-us/library/cc755104%28v=ws.11%29.aspx">official documentation</a>, “[v]ariables set with setx variables are available in future command windows only, not in the current command window”. In particular, you will need to start a new cmd.exe instance after entering the above command in order to utilize the new variable d’environnement.
Thanks to Scott Bartell for pointing this out.