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...
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(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, ...
print('ValueError') exceptUnicodeError as e: print('UnicodeError') 第二个except永远也捕获不到UnicodeError,因为UnicodeError是ValueError的子类,如果有,也被第一个except给捕获了。 Python所有的错误都是从BaseException类派生的,常见的错误类型和继承关系看这里: https://docs.python.org/3/library/exceptions.h...
print('run in c() end!') c() 输出: run in c() satrt! run in b() satrt! run in a() start! Traceback (most recent call last): File "C:/Users/test/Desktop/test01.py", line 18, in <module> c() File "C:/Users/test/Desktop/test01.py", line 15, in c ...
error: {e}") else: # 如果没有异常发生且try中没有return时执行的代码 print("No except...
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(...
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 ...
print("Unable to open camera") exit() # Initialize Mediapipe Hands object withmp_hands.Hands(static_image_mode=False, max_num_hands=2, min_detection_confidence=0.5)ashands: whileTrue: # Read the frame from the video capture ret, frame...
(uri, req_data) if ops_return_result(ret): logging.error('Failed to download file "%s" using HTTP ret %s' % (os.path.basename(local_path),ret)) ret = ERR else: ret = OK return ret except Exception as reason: print_ztp_log(f'Failed to download file {os.path.basename(local_path...