When you use try… except in your code, it’s actually only capable of catching the first exception that occurs within the try block. If you try to raise multiple exceptions, the program will finish after handling the first exception. The rest will never be raised. You can show this using...
To add multiple Exceptions to the except clause, you need to pass them as parenthesized tuple as the first argument. The second argument is an optional name, which when supplied will bind the Exception instance that has been raised. Example, some_list = [1, 2, 3] try: # This should ...
import time from functools import wraps def retry(max_tries=3, delay_seconds=1): def decorator_retry(func): @wraps(func) def wrapper_retry(*args, **kwargs): tries = 0 while tries < max_tries: try: return func(*args, **kwargs) except Exception as e: tries += 1 if tries == ma...
If the assertion fails, Python uses ArgumentExpression as the argument for the AssertionError. AssertionError exceptions can be caught and handled like any other exception, using the try-except statement. If they are not handled, they will terminate the program and produce a traceback. Example He...
name multiple exceptions as a parenthesized tuple, for example: 一个:keyword:`try` 语句可能包含多个 except 子句,分别指定处理不同的异 常。至多只会有一个分支被执行。异常处理程序只会处理对应的 try 子句中发 生的异常,在同一个 :keyword:`try` 语句中,其他子句中发生的异常则不作处 ...
() except: pass # auto splits into multiple cont lines if needed return headertext # smtplib may fail if it won't encode to ascii def encodeAddrHeader(self, headertext, unicodeencoding='utf-8'): try: pairs = email.utils.getaddresses([headertext]) # split addrs + parts encoded = [] ...
(e.g. via builtin ``open`` function)or ``StringIO``.sheet_name : str, int, list, or None, default 0Strings are used for sheet names. Integers are used in zero-indexedsheet positions. Lists of strings/integers are used to requestmultiple sheets. Specify None to get all sheets....
try: whileTrue: data=conn.recv(1024) print("recv:", data) conn.send(data) ifnotdata: conn.shutdown(socket.SHUT_WR) exceptException as ex: print(ex) finally: conn.close() if__name__=='__main__': server(8001) client side
You use try…except blocks to handle errors. Sometimes, you use these to just log the error and continue running. Other times, you manage to recover from the error or calculate some alternative value instead.A short try…except block may look as follows:...
try: return func(*args, **kw) except Exception as e: att += 1 return wrapper return decorator @rety(attempt=3) def crawl_page(url): pass 他发现,这样用起来很顺手,后面又改进了一下,变成了这样。 wait_time = 3 max_retry_times =5 ...