title: Work with 2 version of python
body: <p>I want to make 2 version (python v3 and python v2) working. I have installed both the versions at different directories. I have also placed their location at the Environment Variables/Path. But, only one version i.e python3 works from command prompt. Yes, for removing the conflict of same filename, I have renamed the python.exe of python v3 to python3.exe</p>
  
  <p>Why is python2 not working??</p>
  
  <p>Using:</p>
  
  <pre><code>python
  </code></pre>
  
  <p>throws error: 'python' is not recognized as an internal or external command,
  operable program or batch file.</p>
  
  <p>Directories:</p>
  
  <pre><code>Python3: C:\Python36
  Python2: C:\Python27\ArcGIS10.4
  </code></pre>
  
  <p>Paths on Environment Variables/Path:</p>
  
  <pre><code>C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Common Files\Lenovo;C:\SWTOOLS\ReadyApps;C:\Program Files\SASHome\x86\Secure\ccme4;C:\Program Files\SASHome\Secure\ccme4;C:\Program Files (x86)\Intel\UCRT\;C:\Program Files\Intel\UCRT\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\cygnus\cygwin-b20\H-i586-cygwin32\bin; C:\Python36;C:\Python27\ArcGIS10.4 
  </code></pre>