python collections模块

In [26]: import collectionsIn [27]: words = ["a","a","b","d","a"]In [28]: cnt = collections.Counter(words)In [29]: cnt.most_common(3)Out[29]: [('a', 3), ('b', 1), ('d', 1)]

In [30]: cnt2 = collections.Counter('abcdfff')In [31]: cnt + cnt2Out[31]: Counter({'a': 4, 'b': 2, 'c': 1, 'd': 2, 'f': 3})

In [32]: d = dict([('a',1),('b',2),('c',3)])In [33]: dOut[33]: {'a': 1, 'b': 2, 'c': 3}In [38]: d = collections.OrderedDict([('a',1),('b',2),('c',3)])In [39]: for k,v in d.items():    ...:     print(k,v)    ...:('a', 1)('b', 2)('c', 3)

In [40]: User = collections.namedtuple("User",'name age location phone')In [41]: user = User("li",12,"wuhan","000999")In [42]: user.ageOut[42]: 12In [43]: user.phoneOut[43]: '000999'