print(5/0)
#異常不處理就會報錯誤
#Traceback (most recent call last):
#File “C:\Users\Administrator\Desktop\py\error.py”, line 1, in
#print(5/0)
#ZeroDivisionError: division by zero

使用 try-except 程式碼塊新增異常處理

try:
	print(5/0)
except ZeroDivisionError:
	print("0 不能作為除數")

# 列印0 不能作為除數

try-except-else 程式碼塊try 部分程式碼執行正常後 執行else程式碼塊

mess=input("請輸入一個10的除數： ")
try:
	answer=10/int(mess)
except ZeroDivisionError:
	print("0 不能作為除數")
else:
	print("運算結果； "+str(answer))
#請輸入一個10的除數： 5
#運算結果； 2.0

處理Filenotfoundexception

with open('text.txt') as file_obj:
	mess=file_obj.read()
	print(mess)
	
 #Traceback (most recent call last):
 # File "C:\Users\Administrator\Desktop\py\error.py", line 28, in <module>
 #   with open('text.txt') as file_obj:
#FileNotFoundError: [Errno 2] No such file or directory: 'text.txt' 		

try:
	with open('text.txt') as file_objj:
		mess=file_objj.read()
except FileNotFoundError:
	print("檔案找不到")
else:
	print(mess)
#檔案找不到結果
 

try:
	with open('C:\\Users\\Administrator\\Desktop\\py\\text.txt') as file_objj:
		mess=file_objj.read()
except FileNotFoundError:
	print("檔案找不到")
else:
	print(mess)
#abcdeasdf