Learn Python – Python Loops- Basic and advance

The float of the applications written in any programming language is sequential through default. Sometimes we may additionally need to alter the flow of the program. The execution of a precise code may also need to be repeated a number of numbers of times.

For this purpose, The programming languages grant a range of types of loops which are capable of repeating some precise code numerous numbers of times. Consider the following diagram to recognize the working of a loop statement.

Why we use loops in python?

The looping simplifies the complex problems into the convenient ones. It allows us to alter the flow of the software so that instead of writing the same code again and again, we can repeat the equal code for a finite range of times. For example, if we want to print the first 10 herbal numbers then, instead of the use of the print declaration 10 times, we can print inner a loop which runs up to 10 iterations.

Advantages of loops

There are the following advantages of loops in Python.

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

There are the following loop statements in Python.

Loop Statement Description
for loop The 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 loop The 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 loop The 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).