How to use 'count occurrences of character in string python' in Python

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12def char_count(w):
13 num = 0
14 for i in xrange(len(w)):
15 if re.search(r'[a-zA-Z]', w[i]):
16 num += 1
17 return num
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138def count(s, limit=20):
139 """Counts all matching strings to a given regular expression
140
141 :param s: Regular expression
142 :type s: str
143 :param limit: Range limit
144 :type limit: int
145 :rtype: int
146 :returns: number of matching strings
147 """
148 return _gen(parse(s), limit, count=True)

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