Data dictionary structure -Python

Another variable is the dictionary container model, and can store any type of object.

Each dictionary key  key => value of the colon  : segmentation, key-value pair with a comma between each  split, including the entire dictionary in braces  {} in the following format

d  = { key1  :  value1 ,  key2  :  value2  }

1, the dictionary values ​​([], GET)

= {S 
      "ID": 315, 
      "name": "mineral", 
      "Sex": "female", 
      "Age": 27, 
      "addr": "Shanghai", 
      "Grade": "Capricorn", 
      "Phone ":" 18,317,155,664 ", 
      " Gold ": 100 
    } 

Print (S [" ID "]) Note: [] means, the input key is not present in [], given direct 
print (s.get (" name ") ) Note: get method, there is no input of the key, return None

2, increasing the dictionary Key ([], setDefault )

s [ "man"] = "200" [] Note: The increase in the existing key, direct the development of key value of change values

s.setdefault ( "kai", "12") setdefault Note: increase the existing key, key value change in values

3, the modified key values ​​([])

Input key = values ​​s [] in [ "M"] = "200" 

4, delete the dictionary key (pop, del)

 s.pop ( "phone") print (s) result: { 'id': 315, 'name': 'mineral water', 'sex': 'M', 'age': 27, 'addr': 'Shanghai ',' grade ':' Capricorn ',' gold ': 100,' M ': 300,' kai ':' 12 '} #pop developed delete key, delete the value returned

del s [ "name"] print (s) result: { 'id': 315, 'sex': 'M', 'age': 27, 'addr': 'Shanghai', 'grade': 'Capricorn', 'gold': 100, 'M': 300, 'kai': '12'} #del deleted established key, no return value, delete

5, the query dictionary key, query the dictionary values

s.keys () query the dictionary key

s.values ​​() query the dictionary values

6, the dictionary circulation, remove the key, values

= {S 
      "ID": 315, 
      "name": "mineral", 
      "Sex": "female", 
      "Age": 27, 
      "addr": "Shanghai", 
      "Grade": "Capricorn", 
      "Phone ":" 18,317,155,664 ", 
      " Gold ": 100 
    } 

for I in S: 
    Print (I) withdrawn dictionary key #

I in S for: 
    Print (I, S [I]) # remove dictionary key, values

I in S for: 
    values = s.get (I) 
    Print (I, values) taken # dictionary key, the highest efficiency values

Key for, s.items value in (): 
    Print (key, value) # withdrawn dictionary key, values items in the dictionary is converted into a two-dimensional array of elements, remove the key, low efficiency value

7, it is determined whether the dictionary is present key (in,)

IF "the above mentioned id" in S: 
    Print ( "Hello") This method is recommended

if "id" in s.keys(): print("你好")