Don't Loop Using Indices in Python! | Let's Fix Your Code

A lot of students and inexperienced programmers will loop over a list by index in Python, when in reality they should be looping over it by value. Even if an index is needed (which is a small minority of the time), then one should use enumerate because it gives the index and value at the same time. Further, looping by index does not always work with non-lists, such as sets or dictionaries.

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