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Learn about the Three Types of Loops in Python?

The world of programming languages is a vast area, and knowing about all or studying them all is neither feasible nor realistic. If you want to learn the most popular and helpful programming language as a developer, you must first choose which of the hundreds of languages is the most advantageous to study. This you can easily find out from any website that provides information on the top languages that are popular among web developers now.

Well, previously, among the most popular Programming languages, the one you could find at the top was JavaScript. This was then followed by Java, Python, CSS, PHP, Ruby, C++, C, and many more. Howsoever, the recent Google trend reports state that Python has been on the first rank as people have been searching for studying it to build software projects. Moreover, like programming, these days are not that hard to learn, so if you are just a beginner then Python programming language can be the best for you to study with.

However, if you choose to go for the Python programming language, then this article might get you some help with the concept Python for loop and the three main types of loops that are necessary to study to become an advanced web developer.

Python –Loops

Loops are known as a notion to be found in the Python programming language that enables the process of implementing certain steps repetitiously. This involves printing or executing an analogous sequence of actions based on a keyword to aid usability, such as those given under the automatically indent keyword.

Looping is a commonly known phenomenon found in any programming language required for web development. The Python programming language thus provides different structures that permit the execution of complicated paths. A loop statement thus provides help to implement a single statement for any group of statements multiple times. From the perspective of python, this powerful programming language has three main types of loops which are:

  • While loops
  • For loops
  • Nested loops

While Loops

For a programmer, while loop is allowed only to repeat a group of statements or a single statement only for TRUE condition. It always verifies the condition before performing the loop. In contrast, loops are commonly used to run a collection of statements until the specified condition is met. When the stated condition is met, the following line is called. The loop’s section or the body is determined by the usage of the indented code segments. Here, the loop begins with indentation, and the line from which it proceeds to be unindented marks represents the end of the loop. And for the case of the while loop, all non-zero numbers are taken to be true.

Syntax:

Code

while condition:

loop body

Example:

Code

i=0

while (i<5):

print (i)

i+=1

For Loops

Python for loop allows a programmer to perform a succession of statements several times. It also shortens the code while making it easier to manage the loop variables. These loops are inferred to traverse a sequence of statement sets. The loop’s tenacity is carried on until the final element present in the series is performed. The content present in the body loop is distinguished from the rest of the code by an indent in this while loop. Indentation in python for loop plays a crucial part in deciding the loop body that is involved, just as it does in the while loop. Thus the loop begins only with indentation, and the line from which it begins to be unintended marks states the end of the loop.

Syntax:

Code

For iteration_variable in sequence:

loop body

Example:

Code

for i in range (5) :

print (i)

Nested Loops

As a programmer, a nested loop allows utilizing one or more loops inside any other while or for a loop. The technique of repeating one loop within the bounds of others is what describes the nested looping. As a result, when the command flows towards the inner loop coming from the outer loop. It only reverses to the outer loop once the inner loop gets over. Similar to that of the while and for loop, the content body of the nested loop is also determined by indentation. Moreover, it also begins with indentation, and the line where it begins to be unindented indicates the end of the mentioned loop.

Syntax:

Code

for iterator_var in sequence:

for iterator_var in sequence:

statement (s)

statement (s)

Syntax for a nested while loop statement:

Code

while expression:

while expression:

statement (s)

statement (s)

Example: loop nesting by putting for loop inside a while loop

Code

from_future_import print_function

for i in range (1,5):

for j in range (i):

print (i, end= ‘ ‘)

print ( )

Conclusion

Thus, any programming language’s supremacy is determined only by a categorized collection of coding functionalities. And for the Python programming language, the looping structure it has is mostly stable yet had flexible code. This becomes one of the primary reasons why this programming language had dominated the market among web developers.

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