4
In Python, suppose I have a function:
def func(x):
if x%2 == 0:
j = x/2
print(j)
else:
j = x
print(j)
Don’t mind the logic of the code, it’s just a simple example.
The if and Else blocks are almost identical. Is there any way to avoid this repetition which, if frequent in the code, can make it un-elegant? Something like:
def func(x):
j = x/2, if x%2 == 0, else j=x
print(j)
6
You almost got it right with your example. It’s the ternary operator:
def func(x):
j = x/2 if x % 2 == 0 else x
print(j)
It is not possible to make a elif, but it is possible to connect more than one ternary operator in series.
for i in range(10):
j = x/3 if x % 3 == 0 else x/2 if x % 2 == 0 else x
print(j)
I don’t really recommend doing this, though; a ternary operator already somewhat impairs the readability of the code if it’s not used for something trivial. With more than one on the same line, the code quickly becomes a mess.
2
It could also return the value in one case , and if it does not occur return the other, functioning as an "if/Else" .
def func(x):
if j % 2 == 0:
return x/2
return x
2
Instead of assigning the value to J and then displaying it, you could do the following:
def func(x):
print(x/2 if x%2 == 0 else x)
Yeah, the 'j' was just so the blocks had more than one line.
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Possible Elif instead of Else?
– user93774
@Williamlio see the edited response!
– Pedro von Hertwig Batista
in fact, when chaining the ternary operator "if " the legal is to use parentheses: the precedence is not ambiguous, but the readability is improved.
– jsbueno
@jsbueno can do, but the cool thing is not to chain!
– Pedro von Hertwig Batista