Python多线程应用实例解析-向日葵屋

Python多线程应用实例解析

在Python编程中，多线程是一个非常重要的概念。它允许程序同时执行多个任务，从而提高整体性能。

以下是一些关于Python多线程应用实例的解析：

简单的打印线程：

import threading
def print_thread(text):
    for i in range(5):  # 每次打印5个字符
        print(text[i % len(text)]], end='', flush=True)
    print("\nThread completed.")
if __name__ == "__main__":
    thread = threading.Thread(target=print_thread, args=("Hello Multithreaded!",)))
    thread.start()
    thread.join()  # 确保主线程等待子线程完成

这段代码创建了一个打印线程，它会循环打印字符串。

计算任务的多线程：

import threading
def calculator(num):
    return num * num
threads = []
for i in range(5):  # 创建5个线程
    thread = threading.Thread(target=calculator, args=(i,)))
    thread.start()
    threads.append(thread)  # 将线程添加到列表中，以便后续操作
for thread in threads:
    thread.join()  # 确保主线程等待所有子线程完成
print("All calculator threads completed!")

这段代码创建了5个计算任务的线程。每个线程都会执行一个特定的计算（i * i）。

文件读写多线程：

import threading
import time
def file_reader(file_name):
    with open(file_name, 'r') as f:
        for line in f.readlines():
            print(line.strip())  # 去除行首尾的空白字符
def file_writer(file_name, content="")):
    with open(file_name, 'w') as f:
        f.write(content)
def worker(file_name):
    start_time = time.time()
    try:
        file_writer(file_name, "Task completed!"))
        print(f"Worker {threading.current_thread().name}} completed in {time.time() - start_time} seconds")
    except Exception as e:
        print(f"Error occurred: {str(e)})}")
    finally:
        print("\nWorker thread finished.")
threads = []
file_names = ["file1.txt", "file2.txt", "file3.txt"]  # 创建多个文件名
for i, file_name in enumerate(file_names):
    thread = threading.Thread(target=worker, args=(file_name,))))
    thread.start()
    threads.append(thread)  # 将线程添加到列表中，以便后续操作
print("\nAll worker threads started!")
while len(threads) > 0:  # 确保主线程等待所有子线程完成
    for thread in threads:
        if not thread.is_alive():  # 检查线程是否仍存活
            print(f"\nThread {threading.current_thread().name}} finished.")
            thread.join()  # 确保主线程等待该线程结束
print("\nAll worker threads completed!")