if-elif-else statement in one single line in Python

Writing if-elif-else in multiple lines is old fashion. Everyone will write, so how about writing it in a single line.
In this tutorial, we learn how to write if-elif-else statements in one single line in Python.

For writing if-elif-else in one line in python we use the ternary operator. The ternary operator is also known as a conditional expression.  This operator evaluates something based on a condition being true or false.  It replaces multiple line if-else statements with single lines.

syntax:

[True] if [expression] else [False]

let’s write a simple program

a. Using python if-else statement

age=15
if age>18:
    print('major')
else:
    print('minor')

output:
   minor

b. Using the ternary operator

age=15
x='minor' if age<18 else 'major'
print(x)

output:
   minor

let’s try some nested if-else statements

a. Using python if-else statement

age= int(input())
if age<12:
    print('child')
elif age<20:
    print('teen')
elif age<30:
    print('young')
elif age<50:
    print('middle age')
else:
    print('old')

    

output:
11
child

15
teen

b. Using the ternary operator

age=int(input())
x='child' if age<12 else 'teen' if age<20 else 'young' if age<30 else 'middle age' if age<50 else 'old'
print(x)

output

11
child

15
teen

Note: Writing multiple-line code in a single line reduces the code readability. So if the conditions are a little complex then it is suggested to write the code in normal format. If the code is easy then follow this ternary operator.

 

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