For x == 0, this also blows up. And for x > 1, which base you use matters. E.g. if x == y == 2, >>> from math import log,e >>> 100 * log(2,2) 100.

For x == 0, this also blows up. And for x > 1, which base you use matters. E.g. if x == y == 2, >>> from math import log,e >>> 100 * log(2,2) 100.0 >>> 100 * log(2,e) 69.31471805599453 >>> 100 * log(2,10) 30.102999566398115 I'm aware it's meaningless, but which base did you intend? :)