Python Learning Notes-basic "Fifth Week"--json & pickle Modules

JSON & Pickle Module (serialized)

Two modules for serialization

• JSON, used to convert between string and Python data types
• Pickle for conversion between Python-specific types and Python data types

The JSON module provides four functions: dumps, dump, loads, load

The Pickle module provides four functions: dumps, dump, loads, load

Dumps and dump differences:

Pickle.dump (info,f) #print (Pickle.dumps (info)) #f. Write (Pickle.dumps (info))

Loads and load differences:

Data_from_atm=pickle.load (f) #data_from_atm =pickle.loads (F.read ())

Pickle (unique in Python, supports all Python data types)

Convert a dictionary to a string

1 ImportPickle2F= Open ("User_acc.txt","WB")3 4info={5     "Alex":"123",6     "Jack":"4444"7 }8 9 F.write (Pickle.dumps (info))TenF.close ()

Serialization of

Convert a string to a dictionary

Import Picklef= open ("user_acc.txt","RB") data_from_ ATM=pickle.loads (f.read ())print(DATA_FROM_ATM)

deserialization

JSON (common to all languages, support dictionaries, lists, tuples)

Convert a dictionary to a string

1 ImportPickle2 ImportJSON3F= Open ("User_acc.txt","W")4 5info={6     "Alex":"123",7     "Jack":"4444"8 }9 Ten F.write (Json.dumps (info)) OneF.close ()

Serialization of

Convert a string to a dictionary

1 Import Pickle,json 2 f= open ("user_acc.txt","R")3  4 data_from_atm=json.loads (F.read ())56print(data_ FROM_ATM)

deserialization

Instance:

Python Learning Notes-basic "Fifth Week"--json & pickle Modules