In C language (and many other languages), there is a compact ternary conditional operator that is a compact if-else conditional construct. For instance, in C, a traditional if-else construct looks like:
if (a > b) { result = x; } else { result = y; } |
and the equivalent ternary operator looks like:
result = a>b ? x : y; |
As in the if-else code, only one expression x or y is evaluated.
In Python, from version 2.5, you would write:
results = x if a > b else y |
More formally the ternary operator is written as:
x if condition else y |
So condition is evaluated first then either x or y is returned based on the boolean value of condition.
You can use ternary operator within list comprehension. For example:
[1 if item > else -1 for item in [0,1,-5,2]] |
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