What is int() ?

Answer 1

int() function in Python and Python3 converts a number in given base to decimal. ... string : consists of 1's and 0's base : (integer value) base of the number. Returns : Returns an integer value, which is equivalent of binary string in the given base.

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Answer 2

Its integer numbers, like 10, 20, 3, 4, 8. But not 5.45, 7.56 - these are floating point numbers. You can call it by float()

In python integers numbers used in list (like index), boolean (True = 1, False = 0)