Multiple assignment and evaluation order in Python

Question

What is the difference between the following Python expressions:

# First:

x,y = y,x+y

# Second:

x = y
y = x+y

First gives diffe

Answer 1

The first one is a tuple-like assignment:

x,y = y,x+y

Where x is the first element of the tuple, and y is the second element, thus what you are doing is:

x = y
y = x+y

Wheras the second is doing a straight assign:

x=y
x=x+y