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The range( ) function is an in-built function in Python. This function generates a sequence of numbers.
A sequence is a succession of values bound together by a single name. The range( ) function is generally
used in the for loop to iterate over the sequence of numbers.

The general syntax for using the range( ) function is given below:

range(start, stop, step_size): The start specifies the starting point for generating numbers.
By default, it starts from 0. The stop specifies the position up to which the numbers are to be
generated (last number is not included). The step_size specifies the increment or decrement. By
default, the value of the step_size = 1 and numbers are generated with an increment of 1. However,
we can generate numbers by specifying the value of step_size according to our requirement.
range(start, stop): It generates a set of whole numbers starting from ‘start’ to ‘stop–1’.

Example: range(3, 9) is equivalent to [3, 4, 5, 6, 7, 8].

range(stop): Generates a set of whole numbers starting from 0 to (stop–1).

Example: range(6) is equivalent to [0, 1, 2, 3, 4, 5].

The start and step_size values are optional in the application of range() function and they can be omitted.
Program 1: To print odd numbers till 10 using start, stop and step values of a range function.

Program1.py Output
File Edit Format Run Options Window Help 1
3
for i in range (1,10,2):
5
print(i)
7
9

Program 2: To print a selected range of numbers with start and stop values.

Program2.py Output
File Edit Format Run Options Window Help 3
4
for i in range (3,7):
5
print(i)
6

Program 3: To print whole numbers from 0 to 4 using only stop value.

Program3.py Output
File Edit Format Run Options Window Help 0
1
for i in range (5):
2
print(i)
3
4

Loops in Python 113