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How To Fix - Idle Subprocess Didnt Make Connection Error in Python ?


In this post, we will see - How To Fix - "Idle Subprocess Didn't Make Connection" error in Python. Did you ever face this mind-numbingly stupid issue - whenever you try to access Python GUI  -


IDLE's subprocess didn't make connection. 
Either IDLE can't start or personal firewall software is blocking connection.

IDLE's subprocess didn't make connection. 
See the 'startup failure' section of the IDLE doc online
Note that - Idle is Python's GUI built with tkinter package - having two window types - shell window and the editor window. There are certain checks and inspections that you can do to fix this issue -  

Check :

  • Run Idle from a the command console or terminal and check what it says or if it still results in an error.

    • From the command line -

$ python3 -midlelib  <-- python 3.x
$ python -idlelib.idle <--- python 2.x
    • From code -

import idlelib.PyShell
idlelib.PyShell.main()
 

Check :

  • Does the python program file that you are trying to run i.e. your .py file bear the name (RESERVED NAME) which is same as some standard python library or package file ? If so then Idle will be in an ambiguous state as to how to or in fact which .py file to import ?
  • Rename your python file to something very absurd or unique e.g. blahblahblah.py or may be <your_name.py> . And then try to use Idle again and see if that works.
  • It is a good practice to name your .py code files to something which is less likely to have a common name belonging to a typical python package. AVOID Standard names like -  string.py, math.py, tkinter.py, random.py etc.
 

Check :

  • Check your idlerc folder. Did you make lots of customization like fonts etc. ?Idlerc folder will be located in one of the below locations -

    %userprofile%\\.idlerc\\
    
    C:\\Users\\%userprofile%\\.idlerc
    
    C:\\Users\\{your-username}\\.idlerc
  • Idlerc folder contains following 3 files -
    • config-main.cfg
    • breakpoints.lst
    • recent-files.lst
  • Keep a backup of the above idlerc folder and all it's contents.
  • And then delete the .idlerc directory.
  • See if this helps to fix the issue.
   

Check :

  • Idle uses socket to communicate between the Gui process and your code execution by building a connection as shell window is started.
  • Sometimes a very rigid and stringent anti-virus or firewall settings can prohibit your code process from connecting to the Gui process. This can lead to the above issue.
  • One way would be to allow a exemption for this connection in the antivirus or firewall program. Or if that doesn't work, you might resort to keeping the antivirus\firewall in a less rigid\stringent setting (or may be turn it off temporarily). Or may be run Idle with admin privileges.
 

Check :

  • Is there any orphan or zombie pythonw.exe process running under the hood ?
  • Note that - pythonw.exe suppresses the terminal window on startup. And it has an asynchronous execution.
  • Hence kill any running version of pythonw.exe. Open your Task Manager and kill any or all pythonw.exe processes.
  Quick tip -

  • If you like a terminal window to pop up whenever you run your program, use python.exe
  • If you do not like a terminal window to pop up whenever you run your program, use pythonw.exe.
 

Check:

  • Are you working with a proxy or vpn ? Try working without it and see how it goes.
  Hopefully the above will help to fix the error.  

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