Number data types store numeric values. Number objects are created when you assign a value to them. For example:

var1 = 1 # variable declare with value 1
var2 = 5 # variable declare with value 5

a=10 # variable declare with value 10
print (id(a)) # print variable memory id
print (type(a)) # print data type of 'a' variable 

import sys
a=10 #can grow memory size according to value.
a = sys.getsizeof(12) #get data type size
print(a)  #print size:

You can also delete the reference to a number object by using the del statement. The syntax of the del statement is:

var1 = 1
var2 = 10
del var1
print(var2)

Python supports three different numerical data types:

1. int (signed integers)
2. float (floating point real values)
3. complex (complex numbers)

All integers in Python3 are represented as long integers. Hence, there is no separate number type as long.

A float number is represented as decimal value

n = 10.5 # float data type

A complex number consists of an ordered pair of real floating-point numbers denoted by x + yj, where x and y are real numbers and j is the imaginary unit.

n = 6+9j # Complex Data type

In Python 2, the result of division of two integers is rounded to the nearest integer. As a result, 3/2 will show 1. In order to obtain a floating-point division, numerator or denominator must be explicitly used as float. Hence, either 3.0/2 or 3/2.0 or 3.0/2.0 will result in 1.5

Python 3 evaluates 3 / 2 as 1.5 by default, which is easier for new programmers.