# (Dictionary) #
list tuple list
```python
user=['liangdianshui','twowater','']
```
list
```python
user=[['liangdianshui','111111'],['twowater','222222'],['','333333']]
```
list dict Python dictdict dictionary JAVA map-key-value
```python
user={'liangdianshui':'111111' ,'twowater':'222222' ,'':'333333'}
```
## 1dict ##
(key=>value)(:)(,)({}) ,
```python
dict = {key1 : value1, key2 : value2 }
```
dict
```python
dict1={'liangdianshui':'111111' ,'twowater':'222222' ,'':'333333'}
dict2={'abc':1234,1234:'abc'}
```
## 2 dict ##
```python
#-*-coding:utf-8-*-
dict1={'liangdianshui':'111111' ,'twowater':'222222' ,'':'333333'}
print(dict1)
```
```
{'liangdianshui': '111111', 'twowater': '222222', '': '333333'}
```
## 3 dict ##
//
```python
#-*-coding:utf-8-*-
dict1={'liangdianshui':'111111' ,'twowater':'222222' ,'':'333333'}
print(dict1)
#
dict1['jack']='444444'
print(dict1)
#
dict1['liangdianshui']='555555'
print(dict1)
```
```
{'liangdianshui': '111111', 'twowater': '222222', '': '333333'}
{'liangdianshui': '111111', 'twowater': '222222', '': '333333', 'jack': '444444'}
{'liangdianshui': '555555', 'twowater': '222222', '': '333333', 'jack': '444444'}
```
## 4 dict ##
`del` dict dict
`clear()`
```python
#-*-coding:utf-8-*-
dict1={'liangdianshui':'111111' ,'twowater':'222222' ,'':'333333'}
print(dict1)
# key
del dict1['twowater']
print(dict1)
#
dict1.clear()
print(dict1)
#
del dict1
```
```
{'liangdianshui': '111111', 'twowater': '222222', '': '333333'}
{'liangdianshui': '111111', '': '333333'}
{}
```
## 5 dict ##
(1) dict dict
```python
#-*-coding:utf-8-*-
dict1={'liangdianshui':'111111' ,'twowater':'222222' ,'':'333333','twowater':'444444'}
print(dict1)
print(dict1['twowater'])
```
```
{'liangdianshui': '111111', 'twowater': '444444', '': '333333'}
444444
```
(2) dict
```python
#-*-coding:utf-8-*-
dict1={'liangdianshui':'111111' ,123:'222222' ,(123,'tom'):'333333','twowater':'444444'}
print(dict1)
```
```
{'liangdianshui': '111111', 123: '222222', (123, 'tom'): '333333', 'twowater': '444444'}
```
(3) dict key
list dict
* key
*
list
*
*
## 6dict ##
|||
|---------|--------|
|cmp(dict1, dict2)||
|len(dict)||
|str(dict)||
|type(variable)||
|dict.clear()||
|dict.copy()||
|dict.values()||
|popitem()||
|dict.items()|(, ) |