### 异常处理#### 基本格式```pythontry:    passexcept Exception as e:    pass``````pythontry:    v = []    v[11111] # IndexErrorexcept ValueError as e:    passexcept IndexError as e:    passexcept Exception as e:    print(e) # e是Exception类的对象，中有一个错误信息。``````try:    int('asdf')except Exception as e:    print(e) # e是Exception类的对象，中有一个错误信息。finally:    print('最后无论对错都会执行')    # #################### 特殊情况 #########################def func():    try:        # v = 1        # return 123        int('asdf')    except Exception as e:        print(e) # e是Exception类的对象，中有一个错误信息。        return 123    finally:        print('最后')func()```#### 主动触发异常```pythontry:    int('123')    raise Exception('阿萨大大是阿斯蒂') # 代码中主动抛出异常except Exception as e:    print(e)``````pythondef func():    result = True    try:        with open('x.log',mode='r',encoding='utf-8') as f:            data = f.read()        if 'alex' not in data:            raise Exception()    except Exception as e:        result = False    return result```#### 自定义异常```pythonclass MyException(Exception):    passtry:    raise MyException('asdf')except MyException as e:    print(e)``````pythonclass MyException(Exception):    def __init__(self,message):        super().__init__()        self.message = messagetry:    raise MyException('asdf')except MyException as e:    print(e.message)```##