python set |

Python Event.set()方法 (Python Event.set() Method)

set() is an inbuilt method of the Event class of the threading module in Python.

set()是Python中線程模塊的Event類的內(nèi)置方法。

When the set() method is called, the internal flag of that event class object is set to true. As the set() method gets called for an object, all the threads waiting for that event object get awakened.

調(diào)用set()方法時，該事件類對象的內(nèi)部標(biāo)志設(shè)置為true。 當(dāng)set()方法被一個對象調(diào)用時，所有等待該事件對象的線程都被喚醒。

Module:

模塊：

from threading import Event

Syntax:

句法：

set()

Parameter(s):

參數(shù)：

• None

  沒有

Return value:

返回值：

The return type of this method is <class 'NoneType'>. The method does not return anything. It sets the internal flag of an event object to true.

此方法的返回類型為<class'NoneType'> 。 該方法不返回任何內(nèi)容。 它將事件對象的內(nèi)部標(biāo)志設(shè)置為true。

Example 1:

范例1：

# Python program to explain the # use of set() method in Event() class import threading import timedef helper_function(event_obj, timeout,i):# Thread has started, but it will wait 10 seconds # for the event print("Thread started, for the event to set")flag = event_obj.wait(timeout)if flag:print("Event was set to true() earlier, moving ahead with the thread")else:print("Time out occured, event internal flag still false. Executing thread without waiting for event")print("Value to be printed=", i)if __name__ == '__main__':# Initialising an event objectevent_obj = threading.Event()# starting the thread who will wait for the eventthread1 = threading.Thread(target=helper_function, args=(event_obj,10,27))thread1.start()# sleeping the current thread for 5 secondstime.sleep(5)# generating the eventevent_obj.set()print("Event is set to true. Now threads can be released.")print()

Output:

輸出：

Thread started, for the event to set Event is set to true. Now threads can be released. Event was set to true() earlier, moving ahead with the thread

Example 2:

范例2：

# Python program to explain the # use of set() method in Event() class import threading import timedef helper_function(event_obj, timeout,i):# Thread has started, but it will wait 3 seconds # for the event print("Thread started, for the event to set")flag = event_obj.wait(timeout)if flag:print("Event was set to true() earlier, moving ahead with the thread")else:print("Time out occured, event internal flag still false. Executing thread without waiting for event")print("Value to be printed=", i)if __name__ == '__main__':# Initialising an event objectevent_obj = threading.Event()# starting the thread who will wait for the eventthread1 = threading.Thread(target=helper_function, args=(event_obj,3,27))thread1.start()# sleeping the current thread for 5 secondstime.sleep(5)# generating the eventevent_obj.set()print("Event is set to true. Now threads can be released.")print()

Output:

輸出：

Thread started, for the event to set Time out occured, event internal flag still false. Executing thread without waiting for event Value to be printed= 27 Event is set to true. Now threads can be released.

翻譯自: https://www.includehelp.com/python/event-set-method-with-example.aspx

python set |

總結(jié)

以上是生活随笔為你收集整理的python set |_Python事件类| set（）方法与示例的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯，歡迎將生活随笔推薦給好友。