PySImpleGui error code AttributeError: module 'PySimpleGUI' has no attribute 'Popup'

It sounds like a bad install, or you've got another PySimpleGUI.py file in your path. If you're using PyCharm, control-click the word PySimpleGUI and see where it takes you.

Can you supply info about your runtime setup? Windows/Linux? Versions (Python, PySimpleGUI), etc.

You can get the PySimpleGUI version by entering

pip show PySimpleGUI

It might be worth uninstalling and reinstalling

pip uninstall PySimpleGUI

pip install --no-cache-dir --upgrade PySimpleGUI

[EDIT]

It's often helpful to know exactly what was imported. This can be achieved by adding a print after the import.

import PySimpleGUI as sg
print(sg)

This will tell you the location of your PySimpleGUI.py file. Very handy if you're getting one from somewhere in your path, but you don't know exactly where.

You import 'PySimpleGUI' from the place where no 'Popup'.

Probably you named your file PySimpleGUI.py (and in your file no 'Popup'). In this case rename the file...

Or it might be other file with the name PySimpleGUI.py (where no 'Popup') in the directory where your file is.

Python should open the module (where 'Popup' is present).