Python Learning Note (20): Exception handling

1 defCalc (A, b):2res=a/b3     returnRes4 defMain ():5Money=input ('Enter how much money:')6Months=input ('A few more months:')7     Try:8res=Calc (int (money), int (months))9     exceptZerodivisionerror as E:#if the code inside the try is wrong, go to the code in the except .Ten         Print('The number of repayment months cannot be less than 1', E) One     exceptValueError as E: A         Print('input must be an integer,%s'%e) -     Else:#go without error, else -         Print('should also be%s per month'%Res) theMain ()

1 defCalc (A, b):2res=a/b3     returnRes4 defMain ():5Money=input ('Enter how much money:')6Months=input ('A few more months:')7     Try:8res=Calc (int (money), int (months))9     exceptException as E:Ten         Print('input error, please check the input! %s'E#error is reported abnormal, no specific situation OneMain ()

1 ImportTraceback2 defCalc (A, b):3res=a/b4     returnRes5 defMain ():6Money=input ('Enter how much money')7Months=input ('A few more months:')8     Try:9res=Calc (int (money), int (months))Ten     exceptZerodivisionerror as E:#if the code inside the try is wrong, go to the code in the except . OneTraceback.print_exc ()#just the details of the output error . A         Print('The number of repayment months cannot be less than 1', E) -     exceptValueError as E: -         Print('input must be an integer,%s'%e) the     Else:#go without error, else -         Print('%s should be also per month'%Res) -     Print('Hahahaa') -Main ()

1 ImportPymysql2 defmain2 (SQL):3     Try:4Conn=pymysql.connect (host='122.932.122.11', user='Root', password='123456', db='Test')5     exceptException as E:6         Print('database not connected,%s'%e)7     Else:8Cur=conn.cursor ()9         Try:Ten cur.execute (SQL) One         exceptException as E: A             Print('there is an error in the SQL statement! %s is '%s ''% (E,sql)') -         Else: -res=Cur.fetchall () the             returnRes -         finally:#no matter if you catch an anomaly, you'll be here. - cur.close () -Conn.close ()

1 Try:2A=int (Input ('XX:'))3B=int (Input ('SSS:'))4res=a/b5 exceptException as E:6     Print(e)7 Else:8     Print(RES)9 finally:Ten     Print('when do I get here?')

1 ImportRequests2 defreq ():3R=requests.get ('Http://api.nnzhp.cn/api/user/all_stu', headers={'Referer':'http://api.nnzhp.cn/'})4     Print(R.json ())5     Print(R.json () ['Stu_info'])6     ifLen (R.json () ['Stu_info']) >0:7         Pass8     Else:9         RaiseException ('This interface doesn't have any data .')#proactively throwing ExceptionsTenReq ()

1 ImportRequests2 defreq ():3R = Requests.get ('Http://api.nnzhp.cn/api/user/all_stu', headers={'Referer':'http://api.nnzhp.cn/'})4     #print (R.json ())5     #print (R.json () [' Stu_info '])6     ifLen (R.json () ['Stu_info']) <0:7         Pass8     Else:9         RaiseException ('This interface doesn't have any data .')#proactively throwing ExceptionsTen         #Raise ValueError OneReq ()

Python Learning Note (20): Exception handling