计算文本文件中字母的频率[关闭]

用途

collections.Counter()

from collections import Counterwith open(file) as f:    c = Counter()    for line in f:        c += Counter(line)

如果文件不是很大，则可以将所有文件作为字符串读取到内存中，并通过

Counter

c = Counter(f.read())

例：

>>> c = Counter()>>> c += Counter('aaabbbcccddd eee fff ggg')>>> cCounter({'a': 3, ' ': 3, 'c': 3, 'b': 3, 'e': 3, 'd': 3, 'g': 3, 'f': 3})>>> c += Counter('aaabbbccc')Counter({'a': 6, 'c': 6, 'b': 6, ' ': 3, 'e': 3, 'd': 3, 'g': 3, 'f': 3})

或使用

count()

from string import ascii_lowercase     # ascii_lowercase =='abcdefghijklmnopqrstuvwxyz'with open(file) as f:    text = f.read().strip()    dic = {}    for x in ascii_lowercase:        dic[x] = text.count(x)