Can someone tell me what is wrong with the if statements

Question

name = input("What is your name")
print("How are you today",name)
how = input()
print(how,". me too")
print("What do you like to do")
like=input()
print(like,". I also like to do that")
print("What would you like to do today")
print("1 for add")
print("2 for subtract")
answer = input()
if answer:="1":
a = int(input())
b = int(input())
print(a+b)
if answer :="2":
c = int(input())
d = int(input())
print(c-d)

Answer 1

Why are you using the walrus operator?

Answer 2

ok i will try thank you guys was busy so did not see

Answer 3

what is the walrus operator