How to assign multiple variables one line that depend on each other in python

Question

So I know that you can assign multiple variables in one line like so:

a, b, c = 1, 2, 3

But can you assign a variable based off of the value of another variable in one line?

Idea:

a, b, c = 1, 2, a+b

I know that the idea code doesn’t work but is there some way to replicate this in one line even if longer or weirder?

NOTE:

Using ; like below doesn’t count

a, b = 1, 2; c = a+b

Asked By: TRCK

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Answer 1

Using the the walrus operator it’s possible, if a bit ugly

c = (a := 1) + (b := 2)

NOTE: Assignment expressions (the walrus operator) are only available from Python 3.8 onwards

Answer 2

This only works in 3.8+ and it gets really gross. The "Walrus Operator" lets you make assignments in an expression.

c = (a := 1 ) + (b := 2)

To understand what’s going on, you can see the difference between the "walrus" and the regular assignment in the interactive interpreter:

>>> x = 2

Returns nothing. But similarly:

>>> (x := 2)
2

Returns the 2 that was also assigned to x. So it can be used in an expression while also doing the assignment.

Answered By: Matt Blaha

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