python基礎之錯誤和異常處理

import Exception
# except 在捕獲錯誤異常的時候 是要根據具體的錯誤類型來捕獲的
# 用一個塊 可以捕獲多個不同類型的異常
# EXception 可以捕獲所有異常 當對出現的問題或者錯誤不確定的情況下 可以使用此種
print(dir(Exception))
try:
    # print(b)  #捕獲邏輯的代碼
    li=[1,2,3,4]
    print(li[10])
    pass
except NameError as msg:
    # 捕獲到的錯誤 才會在這裡執行
    print(msg)
    pass
except IndexError as msg:
    print(msg)
print('初次接觸異常')
print('HAHAHAHAHHAHAHAH')

try:
    # print(b)  #捕獲邏輯的代碼
    # li=[1,2,3,4]
    # print(li[10])
    a=10/0
    pass
except NameError as msg:
    # 捕獲到的錯誤 才會在這裡執行
    print(msg)
    pass
except IndexError as msg:
    print(msg)
    pass
except ZeroDivisionError as msg:
    print(msg)
print('初次接觸異常')
print('HAHAHAHAHHAHAHAH')

try:
    print(b)  #捕獲邏輯的代碼
    # li=[1,2,3,4]
    # print(li[10])
    # a=10/0
    pass
# except NameError as msg:
#     # 捕獲到的錯誤 才會在這裡執行
#     print(msg)
#     pass
# except IndexError as msg:
#     print(msg)
#     pass
# except ZeroDivisionError as msg:
#     print(msg)
#     pass
except Exception as msg:
    print(msg)
    pass
print('初次接觸異常')
print('HAHAHAHAHHAHAHAH')

def A(s):
    return 10/int(s)
    pass
def B(s):
    return A(s)*2
def main():
    try:
        B('0')
        pass
    except Exception as msg:
        print(msg)
        pass
    pass
main()
# 不需要在每個可能出錯的地方去捕獲,隻要在合適的層次去捕獲錯誤就可以瞭 這樣的話 就大大減少我們寫try----exception的麻煩
# 異常的拋出機制
#如果在運行時發生異常 解釋器會查找相應的異常捕獲類型
#如果在當前函數裡面沒有找到的話 它會將異常傳遞給上層的調用函數
#如果在最外層 沒有找到的話 解釋器就會退出 程序down掉

class ToolongmyException(Exception): #自定義異常
    def __init__(self,leng):
        '''
         :param leng:長度
        '''
        self.len=leng
    pass
    def __str__(self):
        return '您輸入的數據長度是'+str(self.len)+'已經超過長度瞭'
    pass
def name_Test():
    name=input('請輸入姓名：')
    if len(name)>5:
        raise ToolongmyException(len(name))   #拋出異常
    else:
        print(name)
        pass
    pass
name_Test()

class ToolongmyException(Exception): #自定義異常
    def __init__(self,leng):
        '''
         :param leng:長度
        '''
        self.len=leng
    pass
    def __str__(self):
        return '您輸入的數據長度是'+str(self.len)+'已經超過長度瞭'
    pass
def name_Test():
    name=input('請輸入姓名：')
    try:
        if len(name)>5:
            raise ToolongmyException(len(name))   #拋出異常
        else:
            print(name)
            pass
    except ToolongmyException as result:
        print(result)
        pass
    finally:
        print('執行完畢瞭')
    pass
name_Test()