Python---字典

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An object is hashable if it has a hash value which never changes during its lifetime。Amapping object mapshashable values to arbitrary objects。

字典的键是任意值，值不是hashable。值可以包含列表，字典或者其他的mutable类型。只能使用不可变的对象（比如字符串）来作为字典的键，但是你可以不可变或可变的对象作为字典的值。字典中的键/值对是没有顺序，键值对在字典中以这样的方式标记：d = {key1 : value1, key2 : value2 } 。注意它们的键/值对用冒号分割，而各个对用逗号分割，所有这些都包括在花括号中。

http://blog.csdn.net/facevoid/article/details/5342482链接为字典的方法总结

>>> dishes = {'eggs': 2, 'sausage': 1, 'bacon': 1, 'spam': 500}>>> keys = dishes.keys()>>> values = dishes.values()>>> # iteration>>> n = 0>>> for val in values:...     n += val>>> print(n)504>>> # keys and values are iterated over in the same order>>> list(keys)['eggs', 'bacon', 'sausage', 'spam']>>> list(values)[2, 1, 1, 500]>>> # view objects are dynamic and reflect dict changes>>> del dishes['eggs']>>> del dishes['sausage']>>> list(keys)['spam', 'bacon']>>> # set operations>>> keys & {'eggs', 'bacon', 'salad'}{'bacon'}>>> keys ^ {'sausage', 'juice'}{'juice', 'sausage', 'bacon', 'spam'}test_keys = ['name','age','gender','weight','hight']test_values = ['Hongten','20','M','55','170']#使用zip来构造一个字典print('字典中的keys：')print(test_keys)print('字典中的key对应的value：')print(test_values)print('构造字典后')test_dic = dict(zip(test_keys,test_values))for key in test_dic:    print( key + ':' + test_dic[key])

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