An error occurred. No such file or directory多个异常各自特异处理:多个except语句 对每个异常类型使用一个except语句块处理 try: file = open('test', 'rb') except EOFError as e:#该except处理EOFError类型异常 print("An EOF error occurred.") except IOError as e:#该except处理IOFError类型异常 prin...
如果当try后的语句执行时发生异常,python就跳回到try并执行第一个匹配该异常的except子句,异常处理完毕,控制流就通过了整个try语句(除非在处理异常时又引发新的异常)。 如果在try后的语句里发生了异常,却没有匹配的except子句,异常将被递交到上层的try,或者到程序的最上层(这样将结束程序,并打印缺省的出错信息)。
exceptException,e: printException,":",e try: a=b b=c exceptException,e: printException,":",e 方法二:采用traceback模块查看异常 #引入python中的traceback模块,跟踪错误 importtraceback try: a=b b=c except: traceback.print_exc() 方法三:采用sys模块回溯最后的异常 #引入sys模块 importsys try: ...
exceptOSErroraserr: print("OS error: {0}".format(err)) exceptValueError: print("Could not convert data to an integer.") except: print("Unexpected error:",sys.exc_info()[0]) raise try/except...else try/except语句还有一个可选的else子句,如果使用这个子句,那么必须放在所有的 except 子句之后。
(1, 2) # Mutiple exception in one line try: print(a / b) except (ZeroDivisionError, TypeError) as e: print(e) # Except block is optional when there is finally try: open(database) finally: close(database) # catch all errors and log it try: do_work() except: # get detail from ...
bar('0')exceptExceptionase: logging.exception(e) main()print('END') 抛出错误 抛出错误,首先需要定义一个错误 Class,选择好继承关系,然后用raise语句抛出一个错误实例。如果可以尽量使用Python内置的错误类型,仅在非常必要的时候自己定义错误类。 # err_raise.pyclassFooError(ValueError):passdeffoo(s): ...
a = [] print(avg_value(a)) AssertionError: No values The assert is pretty useful to find bugs in the code. Thus, they can be used to support testing. Conclusion We have covered how try, except, and assert can be implemented in the code. They all come in handy in many cases beca...
Errors and Exceptions 错误是由语法不正确产生的; 异常是没有语法错误的情况下,执行期间产生的。 Built-in Exceptions 列出的内建的异常及其含义。 异常捕获语句: try: # do something except ValueError: # handle ValueError exception except (IndexError, ZeroDivisionError): # handle multiple exceptions # Index...
num = int(input("Enter a number: "))assertnum %2==0except:print("Not an even number!")else: reciprocal =1/numprint(reciprocal) Run Code Output If we pass an odd number: Enter a number: 1 Not an even number! If we pass an even number, the reciprocal is computed and displayed. ...
print("qwerty" + 123456) This is a short and concise way to relay theStackTraceinformation. Hence its usefulness! We’ll also look into how to print it to a file. This is useful in situations where a developer might want to log all the occurred errors and keep a record of it. ...