Questions regarding usage of pandas library

[deanhystad]

To be clear, this is a comprehension.

[[] for _ in indices]

This is just a for loop where I don't plan to use the index value.

for _ in indices

I could write it like this:

for i in indices

But static analysis tools rightfully complain about assigning values to a variable and then never using the variable. Using "_" as a placeholder for the index variable tells is a way of telling Python you want a loop that executes some number of times and that is all.