For-loop doesn't work as intended when replacing a variable with another-CodePudding

So I have this program where the first number you input is the amount of times the for-loop will run, and all the other times it checks if the number divides by 3 without a decimal point, and if true, it adds that number to the sum, then prints the final sum at the end.

a=int(input())
sum=0
for i in range (a):
    a=int(input())
    if a % 3 == 0:
        sum=sum a
print(sum)

But if I replace the "a" in for-loop with another variable(Let's say "b"), like this:

a=int(input())
sum=0
for i in range (a):
    b=int(input())
    if b % 3 == 0:
        sum=sum a
print(sum)

The code doesn't work as intended. I understand it like this: you enter the amount of times the for-loop will run (a); then each time you enter another number(b)(even though it's another variable), Python checks if it divides by 3 without a decimal point, and if true, adds it to the sum; then prints the final sum.

I just wanna know what's wrong in my thinking process here and why the code doesn't work with another variable.

CodePudding user response：

welcome! If you want to add 'b' to the sum, change it under the 'if' statement.

If you meant something else, please elaborate on what you want to achieve.

Good luck.