Fixing Python Spyder Multiprocessing error: AttributeError: module ‘__main__’ has no attribute ‘__spec__’

Python Spyder Multiprocessing error: AttributeError: module ‘__main__’ has no attribute ‘__spec__’ is an error which occurs because of a problem with Spyder’s IPython console.

My goal today is to provide a clear and detailed explanation of why this error is happening and how to solve it, we will also check out other ways to get rid of this problem for good.

Exploring the Python Spyder Multiprocessing error: AttributeError: module ‘main’ has no attribute ‘spec’

This is an error which occurs because of a problem with Spyder’s IPython console.

Please double check the error message in this blog post so you can avoid mixing between different python issues.

                                                                       #
AttributeError: module '__main__' has no attribute '__spec__'
                                                                       #

Bellow we will take care of the error using multiple possible solutions according to your needs.

Solution 1 : Assign the contents of spec to a variable and use it

This is a very popular issue with Spyder’s IPython console.

The solution is simple, you should assign the contents of spec to a variable included in main.

So, instead of using

                                                                       #
if __name__ == '__main__':
                                                                       #

You should be using the following line of code, notice the use of the name variable.

                                                                       #
if __name__ == '__main__':
    __spec__ = "ModuleSpec(name='builtins', loader=<class '_frozen_importlib.BuiltinImporter'>)"
                                                                       #

I hope the fix was enough, Try the method bellow if this one does not work.

Solution 2 : Delete __spec__ Entirely

Sometimes, the error can be removed if you delete __spec__ completely.

For example, you can replace this line of code bellow

                                                                       #
main_mod_name = getattr(main_module.__spec__, "name", None)
                                                                       #

with the following line of code where we removed spec completely

                                                                       #
main_mod_name = getattr(main_module, "name", None)
                                                                       #

If you are one of the unlucky ones who reached this point, I have one more method for you.

Solution 3 : Passing __spec__ = None

The third solution is to pass __spec__ = None

This has worked in my specific case and works great for other people.

I hope your error is gone and using __spec__ = None has the job I expect it to do.

Thank you so much for reading this blog post, good luck with your python projects.

Summing-up : 

That’s it fellow developers, this is the end of this guide, I hope you found this useful in solving the error : Python Spyder Multiprocessing error AttributeError module main has no attribute spec , if you have the means and want to help, please support our work on our Kofi account.

Thank you for reading my blog post to the end, If you want to learn more about the Python programming language, check out the official Python Documentation : https://docs.python.org/3/