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Loops In Python

In this article, we will discuss about loops in python

What Are Loops?

A loop is a sequence of instructions that repeats either a specified number of times or until a particular condition is met.

Types Of Loops

Python supports following loops

While loop
For loop

Let us discuss each loop

While Loop

While loop’ will execute the code block until the condition (specified in while) is met. Here is the syntax

While condition:
      Statements to be executed

Here is an example

x  = 0

while x < 10:
    print ("Value of x is ", x)
    x = x + 1

In the above code, the loop will keep on executing the statements till the time the value of x is less than 10. Once you run the code, you will get following output

Picture showing the output of the while loop in python

Click to Enlarge

You can also use the else statement with while. See the following example

x  = 0

while x < 10:
    print ("Value of x is ", x)
    x = x + 1
else:
    print("Value of x is equal to 10")

Here the else statement will run once x is equal to 10. Here is the output of above program.

Click to Enlarge

For Loop

For loop is used to iterate all items in a collection. Here is the syntax

for  object_variable in collection:
            Statements to be executed.

Consider an example where I have a string and I want to iterate through each and every character of the string. Here is the code

name = "Karan"

for character in name:
    print (character)

Once you run the above code, you will get following output

Picture showing the output of the for loop in python

Click to Enlarge

You can also iterate through a collection. Consider the following example

classmates = ["Karan","sumit","amit"]

for name in classmates:
    print (name)

Once you run the above code, you will get following output

Picture showing the output of the for loop through collection in python

Click to Enlarge

Posted By -	Karan Gupta

Posted On -	Monday, February 18, 2019

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