Which method is used to wait for a thread to complete its execution?join()wait()stop()terminate()

The method used to wait for a thread to complete its execution is the join() method.

Here's how it works:

1. When we start a thread, it runs concurrently with the other threads. Sometimes, we want to wait for a thread to finish its task before we proceed further. This is when we use the join() method.

2. The join() method is called on a thread instance and it blocks the calling thread (i.e., the thread that calls the join() method) until the thread instance on which join() method was called is finished or until the optional timeout occurs.

3. Here is a simple example of how to use join():

# Importing the threading module
import threading

def print_numbers():
    for i in range(10):
        print(i)

def print_letters():
    for letter in 'abcdefghij':
        print(letter)

# Creating threads
t1 = threading.Thread(target=print_numbers)
t2 = threading.Thread(target=print_letters)

# Starting threads
t1.start()
t2.start()

# Wait until t1 thread is completely executed
t1.join()

# Wait until t2 thread is completely executed
t2.join()

# Both threads completely executed
print("Done!")

In this example, the main thread waits for t1 and t2 threads to complete their execution before it proceeds to print "Done!".

Note: The wait(), stop(), and terminate() methods are not used to wait for a thread to complete its execution.