通过while True创建无限循环,通常结合break退出。 示例 python while True: user_input = input("Enter 'quit' to exit: ") if user_input == "quit": break print("You entered:", user_input) 总结 for循环:遍历可迭代对象,适合已知迭代次数或集合元素。 while循环:基于条件执行,适合不确定次数的循环。
笨办法学 Python3 第五版(预览)(二) Learn Python the Hard Way, 5th Edition (Early Release)译者:飞龙协议:CC BY-NC-SA 4.0 练习19:函数和变量 现在你将把函数与你从之前练习中了解到的变量结合起来。如你所知,变量给数据片段一个名称,这样你就可以在程序中使用它。如果你有这段代码: 代码语言:javascrip...
Always ensure the conditional expression can change given the correct exit conditions. In certain situations, it is sensible to add a guard condition to a conditional expression. For example, a loop that validates a user password should limit the number of attempts. The guard often takes the ...
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...
这是你将要输入的下一个Python脚本,它向你介绍了if语句。输入这个代码,确保它能够完美运行,然后我们将看看你的练习是否有所收获。 列表30.1:ex30.py 代码语言:javascript 代码运行次数:0 运行 AI代码解释 1people=202cats=303dogs=15456ifpeople<cats:7print("Too many cats! The world is doomed!")89ifpeople...
用户按ENTER键退出while循环其实，我想你是在找一个代码，让它在按下键盘的某个键之前一直循环运行。
Tip:If you need to terminate a script early, you can usesys.exit(). The remaining code will not be executed. import sys sys.exit(1) Imagine doing these operations for different log formats, and message types – it can get complicated and error-prone very quickly. Maybe there is another...
- Return the device when returning early from degraded md handler. (dlehman) - Fix application of synchronization metaclass to DeviceTree. (dlehman) - Fix AttributeError in populator LUKS helper (vtrefny) - Update spec file for blivet 2.0 builds (vtrefny) ...
{# 'message': 'Error on reading from the event loop self pipe',# 'exception': ConnectionResetError(# 22, 'The I/O operation has been aborted because of either a thread exit or an application request',# None, 995, None# ),# 'loop': <ProactorEventLoop running=True closed=False debug...
init('web') def my_other_thread(): while True: print("I'm a thread") eel.sleep(1.0) # Use eel.sleep(), not time.sleep() eel.spawn(my_other_thread) eel.start('main.html', block=False) # Don't block on this call while True: print("I'm a main loop") eel.sleep(1.0) #...