Python中如何正确使用多线程提高程序执行效率

import threading

def read_file(filename):
    with open(filename, 'r') as f:
        lines = f.readlines()
    return lines

def process_data(data):
    # 处理数据
    pass

def main():
    filename = 'test.txt'

    # 读取文件
    lines = read_file(filename)

    # 处理数据
    thread_pool = []
    for line in lines:
        t = threading.Thread(target=process_data, args=(line,))
        thread_pool.append(t)
        t.start()

    # 等待所有线程执行完毕
    for t in thread_pool:
        t.join()

if __name__ == '__main__':
    main()