[Python] How do I count the trailing zeros in integer?

I am trying to write a function that returns the number of trailing 0s in a string or integer. Here is what I am trying and it is not returning the correct values.

def trailing_zeros(longint):
manipulandum = str(longint)
x = 0
i = 1
for ch in manipulandum:
if manipulandum[-i] == '0':
x += x
i += 1
else:
return x

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