how to find length of number in python

n = 1234 //Any Random Number
digits = len(str(n)) //Saves the number of digits of n into the variable digits

len(str(133))

number_length =  lambda s: len(str(s)) #number length without recursion

#number length with recursion
numlen = 1
def num_len(s):
  if s > 9:
    numlen += 1
  else:
    s = numlen
    numlen = 0
    return s
  return num_len(s//10)