Putting a simple if-then-else statement on one line

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Chapters
00:00 Putting A Simple If-Then-Else Statement On One Line
00:39 Accepted Answer Score 2626
01:06 Answer 2 Score 172
01:18 Answer 3 Score 150
01:45 Answer 4 Score 31
01:54 Thank you

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Full question
https://stackoverflow.com/questions/2802...

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Content licensed under CC BY-SA
https://meta.stackexchange.com/help/lice...

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Tags
#python #ifstatement #syntax #ternaryoperator

#avk47

ACCEPTED ANSWER

Score 2626

That's more specifically a ternary operator expression than an if-then, here's the python syntax

value_when_true if condition else value_when_false

Better Example: (thanks Mr. Burns)

'Yes' if fruit == 'Apple' else 'No'

Now with assignment and contrast with if syntax

fruit = 'Apple'
isApple = True if fruit == 'Apple' else False

fruit = 'Apple'
isApple = False
if fruit == 'Apple' : isApple = True

ANSWER 2

Score 172

count = 0 if count == N else N+1

- the ternary operator. Although I'd say your solution is more readable than this.

ANSWER 3

Score 150

General ternary syntax:

value_true if <test> else value_false

Another way can be:

[value_false, value_true][<test>]

e.g:

count = [0,N+1][count==N]

This evaluates both branches before choosing one. To only evaluate the chosen branch:

[lambda: value_false, lambda: value_true][<test>]()

e.g.:

count = [lambda:0, lambda:N+1][count==N]()

ANSWER 4

Score 31

<execute-test-successful-condition> if <test> else <execute-test-fail-condition>

with your code-snippet it would become,

count = 0 if count == N else N + 1