Python float() built-in function
From the Python 3 documentation
Return a floating point number constructed from a number or string x.
Introduction
The float() function in Python is a built-in function that allows you to convert a number or a string containing a number into a floating-point number. This is particularly useful when you need to perform arithmetic operations that require decimal precision.
The float() function returns a floating point number from a number or a string.
Examples
>>> float('10')
# 10.0
>>> float(10)
# 10.0