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]
>>> 

以上这篇python实现两个字典合并,两个list合并就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持云海天教程。