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Python For Loop ( Class 11)

 Note:- Read it Carefully:

Python Loops

The flow of the programs written in any programming language is sequential by default. Sometimes we may need to alter the flow of the program.

 The execution of a specific code may need to be repeated several numbers of times.

For this purpose, The programming languages provide various types of loops which are capable of repeating some specific code several numbers of times. 


Consider the following diagram to understand the working of a loop statement.

Python Loops

Why we use loops in python?

The looping simplifies the complex problems into the easy ones.


 It enables us to alter the flow of the program so that instead of writing the same code again and again, we can repeat the same code for a finite number of times. 


For example, if we need to print the first 10 natural numbers then, instead of using the print statement 10 times, we can print inside a loop which runs up to 10 iterations.

Advantages of loops

There are the following advantages of loops in Python.

  1. It provides code re-usability.
  2. Using loops, we do not need to write the same code again and again.
  3. Using loops, we can traverse over the elements of data structures (array or linked lists).

There are the following loop statements in Python.

Loop StatementDescription
for loopThe for loop is used in the case where we need to execute some part of the code until the given condition is satisfied. The for loop is also called as a per-tested loop. It is better to use for loop if the number of iteration is known in advance.
while loopThe while loop is to be used in the scenario where we don't know the number of iterations in advance. The block of statements is executed in the while loop until the condition specified in the while loop is satisfied. It is also called a pre-tested loop.
do-while loopThe do-while loop continues until a given condition satisfies. It is also called post tested loop. It is used when it is necessary to execute the loop at least once (mostly menu driven programs).
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Comments

  1. Saiyam dubeyJanuary 26, 2021 at 12:41 PM

    Nice blog sir

    ReplyDelete
  2. Saiyam dubeyJanuary 26, 2021 at 12:47 PM

    Please Write some blogs about libraries of python with some libraries like random , matplotlib.

    ReplyDelete
  3. zk0306577@gmail.comSeptember 20, 2021 at 1:56 PM

    I can give you the address Here you will learn how to do it correctly. Read and write something good. click here

    ReplyDelete

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