I got this error twice today while creating lists of lists of complicated stuff. The first time I was puzzled, but the second time I knew that I had just forgotten a comma. If you google this, you will too.
Reduced example
>>> [[1,2,3] # forgot comma
[4,5,6]]
Traceback (most recent call last):
File "<pyshell#10>", line 2, in <module>
[4,5,6]]
TypeError: list indices must be integers, not tuple
Terry Jan Reedy
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