python創建字典的三種方式

創建空字典：

    dict_eq={}
    print(type(dict))

直接賦值創建字典：

    dict_eq={'a':1,'b':2,'c':'adbc'}

通過關鍵字dict和關鍵字參數創建

    dict_eq=dict(spam = 1, egg = 2, bar =3)

通過二元組列表創建

    >>> list = [('spam', 1), ('egg', 2), ('bar', 3)]
    >>> dic = dict(list)

dict和zip結合創建

    dic = dict(zip('abc', [1, 2, 3]))

通過字典推導式創建

    >>> dic = {i:2*i for i in range(3)}
    >>> dic
    >>> {0: 0, 1: 2, 2: 4}

通過dict.fromkeys()創建

>>> dic = dict.fromkeys(range(3), 'x')
>>> dic
{0: 'x', 1: 'x', 2: 'x'}