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python实现两个字典合并,两个list合并

  • 作者： 佚名     来源： 网络转载
  • 时间：2019-12-02

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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