string - Adding to a Python Dictionary - 


def countfrequency(l):     fdict = {}     x in range(0, len(l)):         key, value in fdict:             if l[x] == fdict[str(x)]:                 value = value + 1             else:                 fdict[l[x]] = 1     return fdict

i'm trying count frequency of occurrences of particular symbol in given string , create dictionary out of this. reason, function returns empty dictionary. think problem arises adding new value dictionary, not sure how troubleshoot it/fix it. 

input: countfrequency('mississippi') output: {}

do this:

def countfrequency(l):     fdict = {}     x in range(0, len(l)):         if str(l[x]) in fdict.keys():            fdict[str(l[x])] = fdict[str(l[x])] + 1         else:            fdict[str(l[x])] = 1     return fdict

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