Loops in Python

Loops are used when you have a block of code which you want to repeat a fixed number of times. There are two type of loops in python:

• While Loop
• For Loop

While Loop

While loop in python is also known as pre-tested loop, because it first tests the condition then it allows the statement to execute written under it, until it is true.

For Loop

A for loop is used for iterating over a sequence (that is either a list, a tuple, a dictionary, a set, or a string). For loop is written with range function.

The Range() Function

The range is built in function in Python that allows you to generate a series of numbers within a given range. There are three ways you can call range():

• Range(stop)
• Range(start, stop)
• Range(start, stop, step)

Example 1 - 

for x in range(5):
print(x)

Output - 

0
1
2
3
4

Example 2 - 

for x in range(1, 5):
print(x)

Output - 

0
1
2
3
4

Example 3 -

for x in range(1, 10, 2):
print(x)

Output - 

1
3
5
7
9