python005--python基礎異常的處理
阿新 • • 發佈:2018-11-13
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)
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