import time try: # 如果你觉得代码可能出现问题, 那么放在try语句中, 只执行一次; print(s) # print("hello") except NameError as e: # 对于异常进行一个重命名;记录了异常的详细信息; # 可能执行一次, 也可能不执行; print("名称错误") with open("except.log", 'w') as f: f.write(time.ctime...
print(nfe)3.3 上下文管理器与with语句3.3.1with语句的异常控制特性 with语句不仅简化了资源的获取和释放过程,还能在处理异常时自动调用__exit__方法进行清理。 class ManagedResource: def __enter__(self): self.resource = acquire_resource() return self.resource def __exit__(self, exc_type, exc_val, ...
sys.exit(1)print('SysExit')print('outer')#是否执行举例2:#捕获这个异常importsystry: sys.exit(1)exceptSystemExit:print('SysExit')print('outer') 举例3:#对应的捕获用户中断行为Ctrl + ctry:importtimewhileTrue: time.sleep(0.5)passexceptKeyboardInterrupt:print('crtl + c')print('outer') 3、Exce...
print(‘我的年龄是’+str(age)) ⼆、AttributeError:属性错误,特性引⽤和赋值失败时会引发属性错误# tp=('1','3','5') tp.append('7') print(tp) 报错信息:AttributeError: 'tuple' object has no attribute 'append' 提示:属性错误:元组对象没有“append”的属性,简单来说元组是不可变对象 解决...
next=raw_input("> ")if"map"innext and"code"innext:dead("You're greed surpassed your wisdom.")elif"map"innext:print("OK, you have the map.")theobject="map"print("Now you must exit and go ahead")opening()# Moved thefunctioncall before thereturnstatementreturntheobject ...
while 1: try: n = int(input("enter a integer (0-exit): ")) print(n) if n == 0: break except: print("try again...") ''' enter a integer (0-exit): 5 5 enter a integer (0-exit): a try again... enter a integer (0-exit): 0 0 ''' 示例一。 用实例调用方法 calc(...
read() print( "文件已经关闭" ) # 当执行到print语句时,with关键字已经自动关闭了text.txt文件 with关键字本质上是一个上下文管理器。 with后面的对象必须要有__enter__和__exit__方法,因为当进入到with代码块的时候会自动调用被with关键字打开对象的__enter__方法,当退出with代码块时,会自动调用对象__exit...
2. AssertionError: A name collision occurred AssertionError: A name collision occurred between blueprints <flask.blueprints.Blueprint object at 0x0000021A675375F8> and <flask.blueprints.Blueprint object at 0x0000021A67537400>. Both share the same name "admin_bp". Blueprints that are created on ...
有两种可能的解决办法：1. 按下 Ctrl-C 来关闭你的程序。这在 Linux 系统上也可以用。2....
If you’re tinkering with a script like this, then you’ll want subprocess to fail early and loudly.CalledProcessError for Non-Zero Exit Code If a process returns an exit code that isn’t zero, you should interpret that as a failed process. Contrary to what you might expect, the Python...