Validating user input strings in Python

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You are testing if the user input is yes or no. Add a not:

while userInput not in ['yes', 'no']:

Ever so slightly faster and closer to your intent, use a set:

while userInput not in {'yes', 'no'}:

What you used is userInput in ['yes', 'no'], which is True if userInput is either equal to 'yes' or 'no'.

Next, use a boolean to set endProgram:

endProgram = userInput == 'no'

Because you already verified that userInput is either yes or no, there is no need to test for yes or no again to set your flag variable.

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