Multiple assigment to variable in same line (Python 3)

Question

how does this script works and why the variable b get 50 as its value and not 1

a = 1
b = 50
b, b = a, b
print(b)

actual result: 50

Because the right-hand side is fully evaluated before the assignment. You can think of it as creating a tuple (a, b) == (1, 50) first — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Apr 9, 2019 at 20:45

DeepSpace · Accepted Answer · 2019-04-09 20:46:08Z

2

b, b = a, b is actually a tuple assignment, and it works from left to right.

b, b = a, b evaluates to (b, b) = (1, 50) which in turn is executed as

b = 1
b = 50

answered Apr 9, 2019 at 20:46

DeepSpace

82.1k12 gold badges119 silver badges166 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1