Counting letter occurances Python

Question

I am trying to count letter occurances and print them. This is what i have so far:

def histogram(L):
    d = {}
    for x in L:
      for letter in x:
               


        

Answer 1

Just for fun, lets simplify your code. You can use a set() on the initial string to get a list of the unique characters, then just use the count method of the list.

def histogram(L):
    d = {letter:L.count(letter) for letter in set(L)}
    for key in d:
        print "{} | {}".format(key, d[key]}