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Python Number(s) : Introducing you to Python Number System

by WhereWhatHow
Python Number

In this tutorial, you will learn about Python Number, Type Conversion, and Mathematics with the help of examples.

The number data types are used to store the numeric values.

Python supports integers, floating-point numbers and complex numbers. They are defined as intfloat, and complex classes in Python.

  • int – holds signed integers of non-limited length.
  • float – holds floating decimal points and it’s accurate up to 15 decimal places.
  • complex – holds complex numbers.

Python Number/Numeric Data Type

Integers and floating points are separated by the presence or absence of a decimal point. For instance,

  • 5 is an integer
  • 5.42 is a floating-point number.

Complex numbers are written in the form, x + yj, where x is the real part and y is the imaginary part.

We can use the type() function to know which class a variable or a value belongs to.

Let’s see an example,

num1 = 5
print(num1, 'is of type', type(num1))

num2 = 5.42
print(num2, 'is of type', type(num2))

num3 = 8+2j
print(num3, 'is of type', type(num3))


5 is of type <class 'int'>
5.42 is of type <class 'float'>
(8+2j) is of type <class 'complex'>

In the above example, we have created three variables named num1num2 and num3 with values 55.42, and 8+2j respectively.

We have also used the type() function to know which class a certain variable belongs to. Since,

  • 5 is an integer value, type() returns int as the class of num1 i.e <class 'int'>
  • 5.42 is a floating value, type() returns float as the class of num2 i.e <class 'float'>
  • 1 + 2j is a complex number, type() returns complex as the class of num3 i.e <class 'complex'>

Python Number Systems

The numbers we deal with every day are of the decimal (base 10) number system.

But computer programmers need to work with binary (base 2), hexadecimal (base 16) and octal (base 8) number systems.

In Python, we can represent these numbers by appropriately placing a prefix before that number. The following table lists these prefixes.

Number SystemPrefix
Binary0b or 0B
Octal0o or 0O
Hexadecimal0x or 0X

Here are some examples

print(0b1101011)  # prints 107

print(0xFB + 0b10)  # prints 253

print(0o15)  # prints 13

Type Conversion in Python

In programming, type conversion is the process of converting one type of number into another.

Operations like addition, subtraction convert integers to float implicitly (automatically), if one of the operands is float. For example,

print(1 + 2.0) # prints 3.0

Here, we can see above that 1 (integer) is converted into 1.0 (float) for addition and the result is also a floating point number.

Explicit Type Conversion

We can also use built-in functions like int()float() and complex() to convert between types explicitly. These functions can even convert from strings.

num1 = int(2.3)
print(num1)  # prints 2

num2 = int(-2.8)
print(num2)  # prints -2

num3 = float(5)
print(num3) # prints 5.0

num4 = complex('3+5j')
print(num4)  # prints (3 + 5j)

Here, when converting from float to integer, the number gets truncated (decimal parts are removed).

Similarly when converting from integer to float, .0 is postfixed to the number.

Python Random Module

Python offers the random module to generate random numbers or to pick a random item from an iterator.

First we need to import the random module. For example,

import random

print(random.randrange(10, 20))

list1 = ['a', 'b', 'c', 'd', 'e']

# get random item from list1

# Shuffle list1

# Print the shuffled list1

# Print random element


['d', 'b', 'c', 'e', 'a']

Python Mathematics

Python offers the math module to carry out different mathematics like trigonometry, logarithms, probability and statistics, etc. For example,

import math








Python Number

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