# Putting a simple if-then-else statement on one line [duplicate]

## Problem

I’m still learning Python, but I’m enjoying the brevity of the syntax. Is there a simpler method to write an if-then-else expression that fits on a single line?

For example:

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

Is there a more straightforward way of expressing this? In Objective-C, I’d write it like this:

``````count = count == N ? 0 : count + 1;
``````

Is there anything comparable in Python?

Update

I know I can use count == (count + 1) percent N in this situation.

I’m inquiring about the syntax in general.

## Solution #1

Here’s the python syntax for a ternary operator expression rather than an if-then.

``````value_when_true if condition else value_when_false
``````

A Better Case Study: (thanks Mr. Burns)

‘Yes’ if fruit equals ‘Apple,’ otherwise ‘No.’

Now, compare and contrast assignment and if syntax.

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

vs

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

## Solution #2

You can also use the “standard” if syntax and combine it into a single line with a colon.

``````if i > 3: print("We are done.")
``````

or

``````field_plural = None
if field_plural is not None: print("insert into testtable(plural) '{0}'".format(field_plural))
``````

## Solution #3

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

– the ternary operator. Although I’d say your solution is more readable than this.

## Solution #4

General ternary syntax:

``````value_true if <test> else value_false
``````

Another option is to:

``````[value_false, value_true][<test>]
``````

e.g:

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

This compares and contrasts both branches before deciding on one. To only look at the branch you’ve chosen:

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

e.g.:

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

## Solution #5

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

It would become, with your code-snippet,

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