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 PythonEdit
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 , Python treats this number as a real number (not a whole number)!
from math import sqrt a = sqrt(100) print(a.is_integer())
Addition, subtraction and multiplicationEdit
The first three operations are denoted by the symbols +, - and * as in most programming languages. The sum, difference and product of two (or more) whole numbers are all integers.
a=5 b=-8 print(a+b) print(a-b) print(a*b)