Numbers in Python

There are mainly two types of number in Python:

1. Integer numbers which are whole numbers
2. Floating point numbers with decimal points

Let’s see some examples:

>>> 2 + 2
4
>>> 50 - 5*6
20
>>> (50 - 5.0*6) / 4
5.0

The return type of a division (/) operation depends on its operands. If both operands are of type int, floor division is performed and an int is returned.

If either operand is a float, classic division is performed and a float is returned. The // operator is also provided for doing floor division no matter what the operands are. The remainder can be calculated with the % operator. You can calculate power using ** operator.

>>> 17 / 3  # int / int -> int
5
>>> 17 / 3.0  # int / float -> float
5.666666666666667
>>> 17 // 3.0  # explicit floor division discards the fractional part
5.0
>>> 17 % 3  # the % operator returns the remainder of the division
2
>>> 5 ** 2  # square of 5
25

What is the output of 3/2 in Python 3 ??

a) 1 b) 1.5

Answer is : option B.

Python 3 performs true division by default!

Does 0.1+0.2–0.3 equal 0.0 ??

If you say YES, you are wrong. Refer following url for better understanding:

14. Floating Point Arithmetic: Issues and Limitations - Python 2.7.15 documentation

In next chapter, we will look into Variable assignments.

Happy Coding!