Single line while loop Python | Example code

If the while loop body consists of one statement, write this statement into the same line: while True: print(‘Hello’). Even you can write a single line while loop which has multiple iterations in Python.

a = 5
while a > 0: a = a - 1; print(a)

The upper code will print 4 to 0 numbers. But It also covers the limitations of this approach.

Python One Line While Loop Example

Simple examples code.

Single-Statement While Loop One-Liner

This code will run infinite iteration so do use exit before running it.

while True: print('Hello') #;exit();

Output:

Single line while loop Python

Multi-Statement While Loop One line

It is not as readable, and it doesn’t conform to PEP 8, but it is doable.

a = 5
while a > 0: a = a - 1; print(a)

Output:

4
3
2
1
0

Nested Compound Statements While Loop Single line

When using a compound statement in python (statements that need a suite, an indented block), and that block contains only simple statements, you can remove the newline, and separate the simple statements with semicolons.

However, that does not support compound statements.

So:

if expression: print "something"

works, but

while expression: if expression: print "something"

does not because both the while and if statements are compound.

Source: stackoverflow.com

Do comment if you have any doubts and suggestions on this Python while loop topic.

Note: IDE: PyCharm 2021.1.3 (Community Edition)

Windows 10

Python 3.7

All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.


Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.