# Mathematics with Python and Ruby/Whole numbers in Python

Whole numbers are not the only numbers, as we will see in the following chapters. So what does Python do to know if a number is whole? As the language is weakly typed, it must guess. The criterium is simple: in order for a number to be whole, it must not have a decimal point.

# Whole numbers in Python

Thus, if one enters

a = 3
print(type(a))
b = 3.14
print(type(b))
c = int(b)
print(c)


one notes that Python knows that a is whole, that b is not, and that c can be whole although it was obtained from b (which is real).

Certain calculations that should give a whole result do not always do so in Python. For example, while ${\displaystyle {\sqrt {100}}\in \mathbb {N} }$, Python treats this number as a real number (not a whole number)!

from math import sqrt
a = sqrt(100)
print(a.is_integer())


# Operations

a=5