title: Can't open file 'file.py': [Errno 2] No such file or directory
body: <p>I'm using Windows10 and wants to run my python script by cmd</p>
  
  <p>The command:</p>
  
  <p><code>python file.py</code></p>
  
  <p>return the message: </p>
  
  <p><code>python: can't open file 'file.py': [Errno 2] No such file or directory</code></p>
  
  <p>but when I run 
   <code>python C:\Python37\projects\file.py</code>
  it's run properly</p>
  
  <p><strong>also, I added  <code>C:\Python37\projects</code> to the PATH, but it doesn't help</strong></p>