python 字典的一些操作

python 字典的一些操作[Python常见问题]

python实现两个字典合并

方法一:借助dict(d1.items() + d2.items())的方法

1 a={"a":1,"b":2,"c":3}
2 b= {"aa":11,"bb":22,"cc":33}
3 dict(a.items()+b.items())
4 # 结果:
5 {"a": 1, "aa": 11, "c": 3, "b": 2, "bb": 22, "cc": 33}

方法二:借助字典的update()方法

1 a={"a":1,"b":2,"c":3}
2 b= {"aa":11,"bb":22,"cc":33}
3 c={}
4 c.update(a)
5 c.update(b)
6 print(c)
7 # 结果:
8 {"a": 1, "aa": 11, "c": 3, "b": 2, "bb": 22, "cc": 33}

方法三:借助字典的dict(d1, **d2)方法

1 a={"a":1,"b":2,"c":3}
2 b= {"aa":11,"bb":22,"cc":33}
3 dict(a,**b)
4 # 结果:
5 {"a": 1, "aa": 11, "c": 3, "b": 2, "bb": 22, "cc": 33}

方法四:借助字典的常规处理方法

 1 a={"a":1,"b":2,"c":3}
 2 b= {"aa":11,"bb":22,"cc":33}
 3 c = {}
 4 for k,v in a.items():
 5     c[k] = v
 6 for k,v in v.items():
 7     c[k] = v
 8 print(c)
 9 # 结果:
10 {"a": 1, "aa": 11, "c": 3, "b": 2, "bb": 22, "cc": 33}

 

python 遍历字典

遍历键:

1 dict = {"Name": "Runoob", "Age": 7}
2 for i in dict:
3     print(i)

遍历值:

1 dict = {"Name": "Runoob", "Age": 7}
2 for i in dict.values()
3     print(i)

遍历键和值:

1 dict.items()
2 for key,value in dict.items():
3     print(key)
4     print(value)