Python if statement inside for loop

I’m expecting to get "is null", because var0 is equal zero and the if statement shall print is null! Is is a syntax mistake?

var0 = 0
var1 = 1
var2 = 2

for i in range(3):
    if f"var{i}" == 0:
        print("is null")

I’m not getting any output.

>Solution :

For future seekers, comment as answer:

var0 = 0
var1 = 1
var2 = 2

for i in range(3):
    if eval(f"var{i}") == 0:
        print("is null")

Result:

is null