python实现两个字典合并,两个list合并
1.两个字典:a={‘a":1,"b":2,"c":3} b= {‘aa":11,"bb":22,"cc":33}
合并1:dict(a,**b) 操作如下:
>>> a={"a":1,"b":2,"c":3} >>> b= {"aa":11,"bb":22,"cc":33} >>> dict(a,**b) {"a": 1, "aa": 11, "c": 3, "b": 2, "bb": 22, "cc": 33} >>>
合并2:dict(a.items()+b.items()) 如下:
>>> a={"a":1,"b":2,"c":3} >>> b= {"aa":11,"bb":22,"cc":33} >>> dict(a.items()+b.items()) {"a": 1, "aa": 11, "c": 3, "b": 2, "bb": 22, "cc": 33} >>>
合并3:c = {} c.update(a) c.update(b) 输出c 如下:
>>> a={"a":1,"b":2,"c":3} >>> b= {"aa":11,"bb":22,"cc":33} >>> c={} >>> c.update(a) >>> c.update(b) >>> print c {"a": 1, "aa": 11, "c": 3, "b": 2, "bb": 22, "cc": 33} >>>
2.两个list合并:
a=[1,2,3,4,5,6] b=[‘a","b","c","d"]
合并1:a+b 如下:
>>> a=[1,2,3,4,5,6] >>> b=["a","b","c","d"] >>> a+b [1, 2, 3, 4, 5, 6, "a", "b", "c", "d"] >>>
合并2:a+=b 这时a的值变成了合并后的结果,如下:
>>> a=[1,2,3,4,5,6] >>> b=["a","b","c","d"] >>> a+=b >>> print a [1, 2, 3, 4, 5, 6, "a", "b", "c", "d"] >>>
合并3:a.extend(b) 和+=结果一样,输出a 如下:
>>> a=[1,2,3,4,5,6] >>> b=["a","b","c","d"] >>> a.extend(b) >>> print a [1, 2, 3, 4, 5, 6, "a", "b", "c", "d"] >>>
合并4:a.append(b)将b看成list一个元素和a合并成一个新的list,合并后的结果输入a 如下:
>>> a=[1,2,3,4,5,6] >>> b=["a","b","c","d"] >>> a.append(b) >>> print a [1, 2, 3, 4, 5, 6, ["a", "b", "c", "d"]] >>>
合并5:a[0:0] = b 使用切片,如下:
>>> a=[1,2,3,4,5,6] >>> b=["a","b","c","d"] >>> a[0:0]=b >>> print a ["a", "b", "c", "d", 1, 2, 3, 4, 5, 6] >>>
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