26. JSON Learning in Python

1.JSON Sequence Description: Provides 4 keywords: dumps,dump,loads,load (exactly the same as the pickle usage)

Syntax: F.write (bytes (Json.dumps (dict), encoding= "Utf-8"))

R=json.loads (F.read (). Decode ("Utf-8"))

The dictionary is stored in a file because the dictionary format cannot be converted into byte format, so the JSON is introduced

A. Converting a dictionary into a JSON sequence into a file

Import JSON accounts={ 1000:{ ' name ': ' Tom ', ' email ': ' [email protected] ', ' passwd ': ' abc123 ', ' balance ': 20000, ' phone ': ' 44165465 ', ' Bank_acc ': { ' ICBC ': 165116161, ' CBC ': 16516516516, ' ABC ': 656151616516 } }, 100 1:{ ' name ': ' Tom1 ', ' email ': ' [email protected] ', ' passwd ': ' abc1123 ', ' Bala nCE ': 210000, ' phone ': ' 441654165 ', ' Bank_acc ': { ' ICBC ': 16511161611, ' CB C ': 165165165161, ' ABC ': 6561516165161 } } } Print (Json.dumps (accounts)) #将字典转 into a JSON sequence F=open ("Account.db", "WB") #写入文件account. db F.write (bytes (json.dumps (accounts), encoding= "Utf-8")) # Write to File account.db F.close () ------------------------------------------------------------------- {"+": {"name": "Tom", "email": "[email protected]", "passwd": "abc123", "balance": 20000, "phone": "44165465", "Bank_ac C ": {" ICBC ": 165116161," CBC ": 16516516516," ABC ": 656151616516}}," 1001 ": {" name ":" Tom1 "," email ":" [email protected] ", "passwd": "abc1123", "balance": 210000, "Phone": "441654165", "Bank_acc": {"ICBC": 16511161611, "CBC": 165165165161, "ABC ": 6561516165161}}

B. Recreate a new Python file to read the contents of the account.db:

Import Pickle Account_file=open ("Account.db", "RB") #打开文件 Account_dict=json.loads (account_ File.read (). Decode ("Utf-8")) #以json加载文件 #print (account_dict) Account_file.close () #print (Type (account_ dict['] [' balance '])) account_dict[' + ' [' balance ']-= #取字典中balance然后减500 P Rint (account_dict) F=open ("Account.db", "WB") F.write (bytes (json.dumps), account_dict "encoding=" )) #将变更后的内容dumps入文件 F.close () Print (account_dict) ---------------------------------------------------- ------------------------- {' + ': {' name ': ' Tom ', ' email ': ' [email protected] ', ' passwd ': ' abc123 ', ' balance ': 20000, ' phone ': ' 44165465 ', ' Bank_ac C ': {' ICBC ': 165116161, ' CBC ': 16516516516, ' ABC ': 656151616516}}, ' 1001 ': {' name ': ' Tom1 ', ' email ': ' [email protected] ', ' passwd ': ' abc1123 ', ' balance ': 210000, ' phone ': ' 441654165 ', ' Bank_acc ': {' ICBC ': 16511161611, ' CBC ': 165165165161, ' ABC ': 6561516165161}}} {' + ': {' name ': ' Tom ', ' email ': ' [email protected] ', ' passwd ': ' abc123 ', ' balance ': 19500, ' phone ': ' 44165465 ', ' Bank_ac C ': {' ICBC ': 165116161, ' CBC ': 16516516516, ' ABC ': 656151616516}}, ' 1001 ': {' name ': ' Tom1 ', ' email ': ' [email protected] ', ' passwd ': ' abc1123 ', ' balance ': 210000, ' phone ': ' 441654165 ', ' Bank_acc ': {' ICBC ': 16511161611, ' CBC ': 165165165161, ' ABC ': 6561516165161}}} {' + ': {' name ': ' Tom ', ' email ': ' [email protected] ', ' passwd ': ' abc123 ', ' balance ': 19500, ' phone ': ' 44165465 ', ' Bank_ac C ': {' ICBC ': 165116161, ' CBC ': 16516516516, ' ABC ': 656151616516}}, ' 1001 ': {' name ': ' Tom1 ', ' email ': ' [email protected] ', ' passwd ': ' abc1123 ', ' balance ': 210000, ' phone ': ' 441654165 ', ' Bank_acc ': {' ICBC ': 16511161611, ' CBC ': 165165165161, ' ABC ': 6561516165161}}}

26. JSON Learning in Python