[求]任意长度字符串中不同字符及个数

# -*- coding:utf8 -*-

result = {}
for c in "abcdefgabc":
    if c not in result:
        result[c] = 1
    else:
        result[c] += 1
for k, v in result.items():
    print "%s, %s" % (k, v)

>>>
a, 2
c, 2
b, 2
e, 1
d, 1
g, 1
f, 1
>>>