conditional expression in one line if statment

Question

self.values is optional parameter (List) in my class.

I have the following code:

self.values.append(area) if self.values else self.values = [area]

This produce

SyntaxError: can't assign to conditional expression

I know I can fix this by doing:

 if self.values:
    self.values.append(area)
 else:
    self.values = [area]

But isn't there a shorter way to set it?

azro · Accepted Answer · 2021-06-24 17:38:41Z

3

You can do the following, using the fact as it the list is None or empty, it's evaluated as false and the other operand of the OR expression will be used

self.values = (self.values or []) + [area]

answered Jun 24, 2021 at 17:38

azro

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1 Comment

flakes Over a year ago

Honestly, I think I would still prefer the if statement alternative. This feels like a little bit of mental gymnastics. Would refactor a little though if self.values is None: self.values = [] and then self.values.append(area)

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