problem with code

[ebolisa]

I wrote this code to count the zeros at the beginning. While i excecuted it for '0001' it gave the right answer(3) but when i ran for '0000' it gives me 1. Can someone explain why? And what should i do for this?

Just for fun!

def beginning_zeros(x):
    count = 0
    for i in range(len(x)):
        if x[i] == '0':
            count += 1
        else:
           pass
    return count

print(beginning_zeros('0.010'))
print(beginning_zeros('1,000,010.05'))