zlacker

>>jstrie+(OP)
Why not:

  def digit_len(n): 
    return len(str(n))

>>_paste+Id
For people who, like me, thought that this would be slower than repeated division: my crappy benchmark indicates that allocating a new string and taking its length is faster by a factor of 2–2.5x.

Edit: In C, the version that loops is 15 times faster than the version that allocates a new string. Python is weird.

>>gnuvin+fe
Yes but performance was not part of the question. Any correct solution would do. I see this a lot that people go an extra mile trying to optimize the solution and introducing bugs along the way instead having a simple certainly correct solution and optimize it later if necessary. It is funny that the string version is faster in Python.