Calculating Logarithms With Python

I am trying to calculate logarithms using the math module of python (math.log(x,[base]), however when I use float(raw_input) for the x and base values, it gives me the error, ZeroD

Solution 1:

Nonsense, it works perfectly well

>>>import math>>>x=float(raw_input())
9.0
>>>base=float(raw_input())
3.0
>>>math.log(x, base)
2.0

Why don't you show us exactly how you reproduce the problem? wim is quite correct - a base of 1 will give that error

>>> base=float(raw_input())
1.0>>> math.log(x, base)
Traceback (most recent calllast):
  File "<stdin>", line 1, in<module>
ZeroDivisionError: float division by zero

On the otherhand - if x<=0 you get a "math domain error"

>>> x=float(raw_input())
0
>>> math.log(x, base)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: math domain error

Solution 2:

You should avoid x<=0 as it is not defined !