Python :=

Question

I just don’t understand the use case for the := operator in python, can someone please explain ?

Answer 1

Jibraeel Abdelwahhab ,

the samples you provided are correct (except the spelling of print(...))

# here is a sample for a code that takes input in a loop until an empty string is encounterd:
inputs = []
inp = " "
while inp:
inp = input()
if inp:
inputs.append(inp)
print(inputs)

#the same task done with the walrus operator:
inputs = []
while inp := input():
inputs.append(inp)
print(inputs)

the code:
while inp := input() takes an input, stores it in a variable, and evaluates the while statement. this is what is called 'assignment expression' enabled
by this operator that was introduced in python 3.8

Answer 2

Hello, i dont have a firm mastery over the python language but I can try to help you understand the walrus operator. := from my understanding means to declare and recieve input on a variable in a print statement.

For example: the slow way
X = input()
Print(x)

The walrus way:
Print(x:=input())

Answer 3

":=" is walrus operator, new in python 3.8;
it's used to declare variables and compare them in the same time;
It's mostly used in statements, loops... etc