Python黑魔法

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1. 賦值

In [1]: x = 1   ...: y = 21   ...: print x, y   ...:    ...: x, y = y, x   ...: print x, y1 2121 1

2. 列表合并

In [2]: a1 = [(2,3),(3,4)]    ...: a2 = [(4,5)]    ...: a = a1 + a2    ...: print a[(2, 3), (3, 4), (4, 5)]

3. 字典合并

方式1:

In [3]: d1 = {‘a‘: 1}    ...: d2 = {‘b‘: 2}    ...:     ...: d1.update(d2)    ...: print d1{‘a‘: 1, ‘b‘: 2}

方式2:

In [4]: d1 = {‘a‘: 1}    ...: d2 = {‘b‘: 2}    ...:     ...: d = dict(d1.items() + d2.items())    ...: print d{‘a‘: 1, ‘b‘: 2}

方式3:

In [5]: d1 = {‘a‘: 1}    ...: d2 = {‘b‘: 2}    ...:     ...: d = dict(d1, **d2)  # 內建函數dict(iterable, **kwarg)    ...: print d{‘a‘: 1, ‘b‘: 2}

 

 

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Python黑魔法

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