Do you know what is loop in Python? Have you ever thought about the process of using loop in Python? Let’s experience how to implement the loops in Python.
But before we jump into the programming aspect of the loop. Let’s think about the process of the loop in normal life.
Loop is a process that goes on circularly in nature. And it gets concluded due to some factors. Let’s assume one situation in daily life.
Suppose, you get stuck in a maze. You are trying your best to get to the exit point of the maze. You started from a certain point in the maze. After traveling a long point in the maze, you found that you came to the same point at that maze. This means you have completed one loop there.
Then you again start to find out the exit point. And again came to the same starting point. In this way, you have completed many loops. Then suddenly, you found a guide there. He guided you to the way to exit the maze. In this way, you exited from the loop as well as from the maze also.
The procedure of the programming loop is the same as above. We have to think from the programming point of view.
But why there is a need to use a loop in Python? Let’s consider one scenario in this case.
Suppose, in a program, there is a need to print a certain statement n number of times. What will you do in such cases? Will you write the print statement n time? It will be easy to write the print statement if the number of times is very less. If the printing number is two or five, then it will be easy to print with the print statement.
But suppose, the number of times has to print is 100 or 1000! Then what will you do in such cases?
Well, in such cases we need to use the loop concept there. Loop helps to print out several statements at a time. It will reduce the complexity of the code. As well as it will help to reduce the time complexity of a certain code.
But wait, is there any way to overcome such scenarios? Yes! There are.
What is the loop in Python?
Loop in Python is a very useful thing to implement. In this case, we have to provide a variable to initialize the loop. Then according to the condition of the loop, it goes on to iterate. After every iteration, it will check the condition. If the condition is fulfilling, then it will again start the iteration. After every iteration, it will change the variable value with some amount. When at any point, it will not fulfill the condition, the loop will get the stop.
The process is the same as the normal life loop. In the above case, the individual got the guide, so he can escape from the maze. Here, in programming also, there is a condition that guides the loop to get closed on time.
How to use the loop in Python:
In Python, there are mainly three ways to use a loop in Python. Every procedure is unique. Every procedure has its way to represent. But among them, there is some procedure very easy & can able to implement in every field of point. Some of them can be able to implement at some point in the field. Let’s make a list of those methods:
- While Loop
- For Loop
- For Each Loop
Let’s know each method one by one in a detailed way.
While Loop in Python:
Before we start, we first know what is while loop is in Python. While loop in Python is the type of method used to implement a loop in codes. It is a different type of process. Here, we have to declare a starting variable & an ending variable outside of the loop.
This means we have to declare these two variables before starting the loop.
Then we have to start the loop. In the starting, we need to provide a condition to the loop. This condition is the checking point of the loop. After every iteration of the loop, it will check whether the condition is satisfying or not.
Then inside of the loop, we have to write the statement which we need to print n number of times. After that, we need to increase or decrease the starting variable. When the starting variable will not fulfill the condition of the loop, the loop will get closed automatically.
General Syntax: while(condition)
After knowing what is while loop is in Python, let’s take an example to clarify the concept.
# Declaring The Starting Variable i=0 # Declaring The Ending Variable n=5 # Declaring The While Loop while(i<=n): # Printing The Statement print("I Love Codingzap!!") # Increasing The Condition i=i+1
Let’s look at the output of the above code. Hence, we come to know how to use the While loop in Python.
For Loop in Python:
For loop in Python is another way to use loop methods in Python. Here we don’t have to declare the starting point separately. For loop provides a method to reduce the work pressure. For loop comes with a method which is known as the range().
The range () method is used to combine the starting variable & ending variable. This method takes two arguments. One is the starting variable & another is the ending variable. Suppose, if we write the method as the range(0, n), then the starting value of the loop is 0 & ending value of the loop is n-1.
Here, there is no need to increment & decrement the value of the starting point. The range () method will do those automatically.
Let’s take a For Loop Python example.
# Declaring The Ending Variable n=5 # Starting For Loop Till The Ending Point for i in range (0,n): # Printing The Statement print("Codingzap Is Great!!")
Let’s look at the output of the above code. Hence, we come to know For loop Python example.
For Each Loop in Python:
Each loop in Python is another way to implement the loop. It is the easiest loop in Python. It is mostly used for the iteration of Strings & Lists. This way is quite different from the traditional For loop. As there is no range() method present here.
Instead of range(), we use a variable that acts as a picking element. It will pick every element from the String or the List. Then it will print every element there in every line.
Let’s take an example to demonstrate the For Each Loop.
# Declaring The String s='Codingzap' # Starting For Each Loop for ele in s: # Printing Every Element Of String print(ele)
Let’s look at the output of the above code. Hence, we come to know how to use For Each loop in Python.
As we saw using loops in Python is a very important topic.
It will help in the future when you will move to the bigger & more difficult questions.
Also, it helps to reduce the calculation difficulties in a certain programming language.
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