Python Tutorial 10 --- "While Loops In Python"

 Python Tutorial 10 ---

"While Loops In Python"

This PROGRAM or TUTORIAL about Python's "While Loops In Python"

DOC

As we know now what loops are and why are they used, in this section, I will go directly towards the working and syntax of while loop along with its comparison with for loop and where to use it.

The syntax for while loop is simple and very much like for loop. We have to use the keyword “while”, along with it we have to put a condition in parenthesis and after that, a colon is placed. The condition could be either true or false. Until the condition is true, the loop will keep on executing again and again. If we use a certain sort of condition in our while loop that, it never becomes false then the program will keep on running endlessly, until we stop it by force. So, this kind of mistake in our syntax is known as logical/human error.

Let us understand the concept of the while loop and why do we use it in areas where the number of iterations are not defined or we do not have any idea how many iterations would take place with the help of an example. Suppose that we have created an application for an ATM from where a customer can only withdraw money up to 5000 rupees. Now our condition in the while loop would be to iterate unless the input is between 1 to 5000. So, the condition will be true unless the user inputs a number between 1 to 5000, so the loop will iterate depending upon the time the user submits the wrong input,

For a While loop to run endlessly we can pass true or 1 as a condition. 1 is also used in place of writing true as a whole. So, in this case, the condition will never become false so the program will run endlessly. But these kinds of programs do not output anything because they could never complete their execution.

CODE

#While Loop in Python

"""A while loop in python runs a bunch of code or statements again and again
    until the given condition is true when the condition becomes false,
    the loop terminates its repetition."""

#To terminate an infinite loop, you can press Ctrl+C on your system.

i = 0
while i<=30:
    print(i)
    i=i+1

"""Output---
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
"""

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