CODEWITHSUNDEEP
pythonternary-operator
M3RS
M3RS

Reputation: 7530

Syntax of one line IF condition in Python

Can someone say why this doesn't work in Python? Is it simply invalid syntax or is there more to it?

arr[0] += 12 if am_or_pm == 'PM'

The error message:

  File "solution.py", line 13
    arr[0] += 12 if am_or_pm == 'PM'
                               ^
SyntaxError: invalid syntax

This works:

if am_or_pm == 'PM': arr[0] += 12

Upvotes: 2

Views: 14683

Answers (2)

Hou Lu
Hou Lu

Reputation: 3222

There is surely a kind of usage in Python that the if and else clause is in the same line. This is used when you need to assign a value to a variable under certain conditions. Like this 

a = 1 if b == 1 else 2

This means if b is 1, a will be 1, else, a will be 2.
But if and else must all be written to form the valid syntax.

Upvotes: 3

Shakhawat Hossain
Shakhawat Hossain

Reputation: 718

python doesn't have semicolon. So there is break line into the same line. python consider code into a same line that written in a line. so here a expression and a conditional statement in a same line that is not valid. python interpreter doesn't recognize what the code exactly mean. you can use separate line for this.

arr[0] += 12 
if am_or_pm == 'PM':

Upvotes: 0

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