Python3 json, logging, SYS modules

JSON module

ImportJsondic= {'name':'Egon',' Age': 32}#------------------------------> Serializationf = open ('Json.txt','W') Data=json.dumps (DIC)Print(data)Print(Type (data)) F.write (data) f.close ()#------------------------------> Return serializationf = open ('Json.txt','R') Data=f.read () Dic1=json.loads (data)Print(DIC1)Print(Type (DIC1)) F.close ()

Second, logging module

ImportLogginglogger=Logging.getlogger () FH= Logging. Filehandler ('Test.log')#for writing to log filesch = logging. Streamhandler ()#for input to terminal#Custom FormatsFormatter = logging. Formatter ('% (asctime) s-% (name) s-% (levelname) s-% (message) s') Fh.setformatter (formatter) sh.setformatter (formatter) logger.addhandler (FH)#Logger object can add multiple FH and SH objectsLogger.addhandler (SH) logger.debug ('Logger Debug Message') Logger.info ('Logger Info Message') logger.warning ('Logger warning message') Logger.error ('Logger error message') logger.critical ('Logger Critical Message')

Third, SYS module

Import Sys

 sys.exit (n) exit program, Exit normally (0)  
 sys.argv command line parameter list,  　　 The first element is the path of the program itself  
 sys.path Returns the search path for the module, using the value of the PYTHONPATH environment variable when initializing  
 
   sys.exit ()   

Import syscount=1 while count<10:    Print(count)    if count ==8:        sys.exit () # Exit program    count+=1print("ending")

sys.argv

#cmd terminal input python sys module. PY Egon 666Print("begin ... ..") ret=sys.argv#[sys module. PY ', "Egon", 666]Print(ret)#[' sys module. PY ', '-u ', ' Egon ', '-P ', ' 666 ']username=ret[1]password=ret[2]ifusername=='Egon'  andpassword=="666":    Print("Login")

Sys.path

Import SYS Print (Sys.path) # ["C:\Users\Administrator\PycharmProjects\python5 period \day13", "python Environment"]  : The directory where the files are executed is added to the Sys.pathBase _dir=r"C:\Users\Administrator\PycharmProjects\python5 period \day12"  Sys.path.append (base_dir)import  lesson1 # Custom Module Lesson1.foo ()

Python3 json, logging, SYS modules