如何在Python中分析多线程程序？

import threading
import time

def print_numbers():
    for i in range(10):
        print(i)
        time.sleep(1)

def print_letters():
    for letter in 'abcdefghij':
        print(letter)
        time.sleep(1)

thread1 = threading.Thread(target=print_numbers)
thread2 = threading.Thread(target=print_letters)

thread1.start()
thread2.start()

thread1.join()
thread2.join()

print('All threads finished.')

import cProfile
import threading
import time

def print_numbers():
    for i in range(10):
        print(i)
        time.sleep(1)

def print_letters():
    for letter in 'abcdefghij':
        print(letter)
        time.sleep(1)

def main():
    thread1 = threading.Thread(target=print_numbers)
    thread2 = threading.Thread(target=print_letters)

    thread1.start()
    thread2.start()

    thread1.join()
    thread2.join()

if __name__ == '__main__':
    cProfile.run('main()')