Count-Trailing-Zeros(x) --- Can I use Log(x) to see if X is equal to ( Integer * 10 ^ k) ???

[Hen Hanna]

Count how many zeros are at the end of your int:

             def    end_zeros(num):
                                 s = str(num)
                                 return len(s) - len(s.rstrip("0"))


print(end_zeros(10))       # == 1
print(end_zeros(101))      # == 0
print(end_zeros(245))       # == 0
print(end_zeros(100100))    # == 2


----------------   Writing a loop (using   %  and // )  feels like [reinventing the wheel] and   seems  intrinsically wrong.


                 i like  this code (above)  because   it's not reinventing the wheel --- the Python  implementor has already done the loop  (using   %  and // ),  so i'm just using that efficient  tool  (routine).