Python int() built-in function
From the Python 3 documentation
Return an integer object constructed from a number or string x, or return 0 if no arguments are given.
Examples
>>> # transform a string to an integer
>>> from_integer = int('29')
>>> from_integer
# 29
>>> type(from_integer)
# <class 'int'>
>>> # transform a float to integer
>>> from_float = int(-3.14)
>>> from_float
# -3
>>> type(from_float)
# <class 'int'>
>>> # return an empty string
>>> int()
# 0