[Tut] Python Ternary Multiple Lines

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[Tut] Python Ternary Multiple Lines - xSicKxBot - 07-15-2020

Python Ternary Multiple Lines

What if you have a ternary operator that’s very long?

Code:
var = 'I want to learn Python' if 42**2<166 else 'I want to learn Go programming'
print(var)
# I want to learn Go programming

Problem: How to write the ternary operator in multiple lines?

Short Recap: Ternary Operator

Ternary Operator: The most basic ternary operator

Code:
x if c else y

consists of three operands

Code:
x

Code:
c

, and

Code:
y

. It is an expression with a return value. The ternary operator returns

Code:
x

if the Boolean expression

Code:
c

evaluates to

Code:
True

. Otherwise, if the expression

Code:
c

evaluates to

Code:
False

, the ternary operator returns the alternative

Code:
y

.

Syntax: The three operands are written as

Code:
x if c else y

which reads as “return

Code:
x

Code:
c

else return

Code:
y

“. Let’s write this more intuitively as:

Code:
<OnTrue> if <Condition> else <OnFalse>

Operand |
Description

<OnTrue> |
The return expression of the operator in case the condition evaluates to

Code:
True

<Condition> |
The condition that determines whether to return the <On True> or the <On False> branch.

<OnFalse> |
The return expression of the operator in case the condition evaluates to

Code:
False

[i]Operands of the Ternary Operator[/i]

Related article: For a full tutorial on the ternary operator, check out our detailed blog article.

Method: Parenthesis to Extend Logical Line Over Multiple Physical Lines

Solution: You can extend any logical line in Python over multiple physical lines by using the parenthesis.

Code:
var = 'I want to learn Python' if 42**2<166 else 'I want to learn Go programming'
print(var) var = ('I want to learn Python' if 42**2<166 else 'I want to learn Go programming')
print(var)
# I want to learn Go programming

This is the PEP8standard way of breaking long lines—if you cannot do it in a more natural way (such as avoiding the ternary operator and using the if statement in this example).

Try it yourself:

https://trinket.io/embed/python/4ff1b0b336

Exercise: Write a nested ternary operator and break it into multiple lines!

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