is there any way to initialize a variable , when we writing the condition of if, and then compare

Question

if (n=2+3)==5:
    print(n)

I executed the above code in python but it was showing an error in "if condition"`. I want to know whether there is a way to achieve writing the initilization statement in "if condition".

No, it will automatically detect the single = sign in the if statement and throw an error. It works somewhat in loops but not the way you have it here. — Noah, Jan 31 '20 at 17:34
In Python 3.8 - https://docs.python.org/3/whatsnew/3.8.html#assignment-expressions — wwii, Jan 31 '20 at 17:35
Does this answer your question? [“:=” syntax and assignment expressions: what and why?](https://stackoverflow.com/questions/50297704/syntax-and-assignment-expressions-what-and-why) — wwii, Jan 31 '20 at 17:38

score 1 · Answer 1 · answered Feb 02 '20 at 08:03

1

In python,we can use walrus operator ( := ) but it was introduced in python 3.8 , so it works only in python 3.8 or latter versions.

if (n:=2+3)==5: print(n)

This works fine and gives output as you expected.

answered Feb 02 '20 at 08:03

Joshua Daniel

11
3

score 0 · Answer 2 · answered Jan 31 '20 at 19:48

Basically what you can place after the 'if' keyword is an expression that either evaluates to true or false. This expression is made up of comparison and logical operators. Ther is no scope for using an assignment operator here. Even if you are thinking of doing that you are following a bad programming practice. Good programming practices are always appreciated so avoid bad ones.Thanks!

is there any way to initialize a variable , when we writing the condition of if, and then compare

2 Answers2