python实现在无须过多援引的情况下创建字典的方法

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本文实例讲述了python实现在无须过多援引的情况下创建字典的方法。分享给大家供大家参考。具体实现方法如下:

1.使用itertools模块


    import itertools
    the_key = ['ab','22',33]
    the_vale = ['aaaa',"dddddddd",'22222222222']
    d = dict(itertools.izip(the_key,the_vale))
    print d

2.加参数


    dict = dict(red = 1,bule = 2,yellow = 3)
    print dict

结果为:{'yellow': 3, 'bule': 2, 'red': 1}

3.使用内置的zip函数
zip([iterable,...])返回一个列表,


    the_key = ['ab','22',33]
    the_vale = ['aaaa',"dddddddd",'22222222222']
    dict2 = dict(zip(the_key,the_vale))
    print type(zip(the_key,the_vale))
    print dict2

结果:


    <type 'list'>
    {33: '22222222222', 'ab': 'aaaa', '22': 'dddddddd'}

4.dict的fromkeys函数
创建的每个键有相同的value


    fromkeys(seq[,value])
    Create a new dictionary with keys from seq and values set to value.

    the_key = ['ab','22',33]
    the_vale = 0
    d = dict.fromkeys(the_key,the_vale)
    print 

结果:{33: 0, 'ab': 0, '22': 0}


    import string
    count_by_letter = dict.fromkeys(string.ascii_lowercase,0)
    print count_by_letter

结果:


    {'a': 0, 'c': 0, 'b': 0, 'e': 0, 'd': 0, 'g': 0, 'f': 0, 'i': 0, 'h': 0, 'k': 0, 'j': 0, 'm': 0, 'l': 0, 'o': 0, 'n': 0, 'q': 0, 'p': 0, 's': 0, 'r': 0, 'u': 0, 't': 0, 'w': 0, 'v': 0, 'y': 0, 'x': 0, 'z': 0}

希望本文所述对大家Python程序设计的学习有所帮助。

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