python histogram one-liner

Question

There are many ways to write a Python program that computes a histogram.

By histogram, I mean a function that counts the occurrence of objects in an iterable

Answer 1

One that works back to 2.3 (slightly shorter than Timmerman's, I think more readable) :

L = 'abracadabra'
hist = {}
for x in L: hist[x] = hist.pop(x,0) + 1
print hist
{'a': 5, 'r': 2, 'b': 2, 'c': 1, 'd': 1}