Python interprets integer as str

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Python3.6

He, I am newly to programing with python. I try to initialize two dimensional array with zeros .
The problem is , when I try to add the size to it Python interpreter says: str object can not be interpreted as integer.
This is the line:

if(chain_of_events):
            list_of_lists_of_events = [[0 for x in range(int(self.number))] for y in range(number_of_events)]

Pylance says both arguments in the two range() functions are integers when I hover them with mouse.

What I have tried:

Try to pass magic/hardcoded values to range() functions and with them there is no problem.