FIX: OSError: [WinError 6] The handle is invalid

[shin-illua]

If you every encounter this error in the future, you can try this tweak and see if it works for you. You basically have to edit the subprocess module. NOTE: This is only for windows, haven't tested it on linux. AND USE IT AT YOUR OWN RISK!

• Open subprocess.py (C:\Python\Python37\Lib\subprocess.py)
• Find the class definition of Popen:
  
• go to def __init__(....): and comment this code:
  

Furthur reference: https://bugs.python.org/issue37380

[tburrows13]

Thanks for noting this. I managed to get around it in versions of Python before v3.7 by adding in self.proc.wait() in #1185, so hopefully this issue does not reappear.