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

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

CodePudding user response：

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

CodePudding user response：

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.