raise Exception("Stopping loop") print(i) except Exception as e: print("Loop stopped:", e) 在这个例子中,当i等于5时,抛出异常停止循环,进入except块处理异常。 4.3 使用场景 异常条件:在循环中检测到异常条件时,停止循环并处理异常。 复杂逻辑控制:在需要复杂的控制逻辑时,结合异常处理。 通过这些方法,P...
if item == 'cherry': print("Found cherry, exiting loop.") break print(item) 在这个例子中,当找到'cherry'时,打印一条消息并退出循环。 二、使用循环条件控制 除了使用break语句,合理设置循环条件也是控制循环终止的有效方法。 2.1 while循环的条件控制 while循环依赖于一个布尔条件来决定是否继续执行,通过动...
whileTrue:ifcondition_1:break...ifcondition_2:break...ifcondition_n:break This syntax works well when you have multiple reasons to end the loop. It’s often cleaner to break out from several different locations rather than try to specify all the termination conditions in the loop header. ...
# asyncio.base_events.BaseEventLoop.run_until_completeclassBaseEventLoop(events.AbstractEventLoop):defrun_until_complete(self, future):# 启动 loopself.run_forever()defrun_forever(self):whileTrue: self._run_once()ifself._stopping:break run_forever中做了一些初始检查和设置,然后进入while循环并在循...
In this tutorial, you'll learn how to add time delays to your Python programs. You'll use decorators and the built-in time module to add Python sleep() calls to your code. Then, you'll discover how time delays work with threads, asynchronous functions, a
try:loop.run_forever()except KeyboardInterrupt:# Canceling pending tasks and stopping the loop # Previous to Python3.7asyncio.gather(*asyncio.Task.all_tasks()).cancel()# After the changesin3.7asyncio.gather(*asyncio.all_tasks()).cancel() ...
基于单词的标记化是三种标记化方法中最简单的一种。标记器将通过拆分每个空格字符(有时称为“基于空白的标记化”)或通过类似的规则集(如基于标点的标记化)将句子分成单词[12]。 例如,这个句子: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 Cats are great,but dogs are better!
(self): logging.info('Entering listener loop...') while not self._stopping: # self.timeout seconds to pull a configuration logging.info("Long polling pulls Apollo configuration, next execution time: {}", datetime.now() + timedelta(seconds=self.timeout)) self._long_poll() logging.info("...
(mysql_conn_loop,session):whilenotstopping:iflen(waiting_urls)==0:awaitasyncio.sleep(0.5)continueurl=waiting_urls.pop()print('start get {}'.format(url))ifre.match('https://www.xxsy.net/book/\d+',url)andurlnotinseen_urls:asyncio.ensure_future(article_handler(url,session,mysql_conn_loop...
while True: self._run_once() if self._stopping: break finally: ... 这个函数不断的调用_run_once(),就像我们抽取出来的loop函数中不断地调用下面这段代码: events = selector.select() for event_key, event_mask in events: callback = event_key.data ...