Count the number of occurrences of a character in a string
str.count(sub[, start[, end]])
Return the number of non-overlapping occurrences of substring
subin the range[start, end]. Optional argumentsstartandendare interpreted as in slice notation.
>>> sentence = 'Mary had a little lamb'>>> sentence.count('a')4
As other answers said, using the string method count() is probably the simplest, but if you're doing this frequently, check out collections.Counter:
from collections import Countermy_str = "Mary had a little lamb"counter = Counter(my_str)print counter['a']