字典
字典与列表属性一致,元素修改。
1、字典定义
>>> dict1={}
>>> dict1
{}
>>> type(dict1)
<type 'dict'>
>>>
字典由键值对组成,键必须保持唯一性!
2、查看字典中的key&value
3、tuple转换成字典
>>> tuple1=(["name", "Andy"], ["gender", "male"])
>>> tuple1
(['name', 'Andy'], ['gender', 'male'])
>>> type(tuple1)
<type 'tuple'>
>>> dict(tuple1)
{'gender': 'male', 'name': 'Andy'}
>>> dict1 = dict(tuple1)
>>> dict1
{'gender': 'male', 'name': 'Andy'}
>>> type(dict1)
<type 'dict'>
>>>
4、定义时就分配键值对
>>> dict3={"name":"Andy", "age":28}
>>> dict3
{'age': 28, 'name': 'Andy'}
>>> dict4={1:2, 3:4, 5:"c", 6:6.4}
>>> dict3
{'age': 28, 'name': 'Andy'}
>>> dict4
{1: 2, 3: 4, 5: 'c', 6: 6.4}
>>>
注意:键和值不能为新定义的变量!!!