title: Windows command line, "python3" pointing to the wrong python3.exe
body: <p>So, I have Anaconda, OSGeo and Python2.7 installed on my computer. </p>
  
  <p>I'm also using Spyder. In Spyder : </p>
  
  <pre><code>&gt;&gt;&gt; import sys
  &gt;&gt;&gt; sys.executable
  'C:\\ProgramData\\Anaconda3\\pythonw.exe'
  </code></pre>
  
  <p>Which is what I want.</p>
  
  <p>However, in the windows command line and powershell :</p>
  
  <pre><code>$ python3
  &gt;&gt;&gt; import sys
  &gt;&gt;&gt; sys.executable
  'C:\\Progra~1\\OSGeo4W\\bin\\python3.exe'
  </code></pre>
  
  <p>Which is <strong>not</strong> what I want. I want to use <code>'C:\\ProgramData\\Anaconda3\\pythonw.exe'</code> (or <code>python.exe</code>, not sure) when using <code>python3</code> in the command line.</p>
  
  <p>Also :</p>
  
  <pre><code>$ pip3
  Fatal error in launcher: Unable to create process using '"'
  </code></pre>
  
  <p>I don't get why <code>python3</code> in the windows command line points to OSGeo's version of Python3. Here is my <code>path</code> :</p>
  
  <pre><code>C:\Python27\;C:\Python27\Scripts;C:\ProgramData\Anaconda3;C:\ProgramData\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Git\cmd;C:\Program Files\PuTTY\;C:\Progra~1\OSGeo4W\bin\;C:\Program Files\Microsoft\R Open\R-3.4.0\bin
  </code></pre>
  
  <p>I also have an environment variable called <code>PYTHONHOME</code></p>
  
  <pre><code>C:\ProgramData\Anaconda3
  </code></pre>
  
  <hr>
  
  <p>Moreover (for completeness of information), I have python 2 installed :</p>
  
  <pre><code>$ python
    File "C:\ProgramData\Anaconda3\lib\site.py", line 177
      file=sys.stderr)
          ^
  SyntaxError: invalid syntax
  </code></pre>
  
  <p>(<code>$ pip</code> outputs the same thing). </p>
  
  <p>Having python3 and python2.7 both work when using <code>python3</code> and <code>python</code> (respectively) in the windows command line would be a nice bonus, but it's not really my priority.</p>