Bugs That Bite
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Bugs That Bite

TypeError: cannot unpack non-iterable NoneType object

Forgetting to set a python variable or some related problem

Whenever you see NoneType in Python it usually means that something didn’t get set correctly. The other information is somewhat extraneous except possibly “unpack” because it gives you a clue what the program was trying to do, but your line of code will show you that as well.

Check your code to see that you set all the variables you think you set or the values you are passing into a function.

In my case I had inadvertently commented out the line of code returning a value from a function. That value was used in a subsequent function. That caused the value my program was trying to read to be null.

My program was trying to “unpack” a list of values returned from the function and hence the error:

TypeError: cannot unpack non-iterable NoneType object

Teri Radichel

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