Walrus Operator

Question

What is walrus operator in python3?

Answer 1

:=

It's one of the new features of python (3.8 for testing tho... )

"...since := is an expression, it can be used in contexts where statements are illegal, including lambda functions and comprehensions..." *

i.e. It allows to assign a value to a variable in a condition*:

# python 3.7
m = pattern.search(w))
If m is not None:
process(m)

# using :=
if (m := pattern.search(w)) is not None:
process(m)

*https://www.python.org/dev/peps/pep-0572/#differences-between-assignment-expressions-and-assignment-statements