TypeError: list indices must be integers, not str Python

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When you iterate over a list, the loop variable receives the actual list elements, not their indices. Thus, in your example s is a string (first abc, then def).

It looks like what you’re trying to do is essentially this:

orig_list = ['abc', 'def']
map_list = [(el, 1) for el in orig_list]

This is using a Python construct called list comprehension.

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