import multiprocessing
import time

def sing():
    for i in range(3):
        print("唱歌。。。")
        time.sleep(0.5)
def dance():
    for i in range(3):
        print("跳舞。。。")
        time.sleep(0.5)
if __name__ == '__main__':
    time1 = time.time()
    s1 = multiprocessing.Process(target=sing)
    d1 = multiprocessing.Process(target=dance)
    s1.start()
    d1.start()
    s1.join() #這個(gè)方法可以等待子進(jìn)程結(jié)束后再繼續(xù)往下運(yùn)行，通常用于進(jìn)程間的同步
    d1.join()
    print(time.time()-time1)

import multiprocessing
import time

def sing(name, num):
    for i in range(num):
        print("%s在唱歌。。。"%name)
        time.sleep(0.5)
def dance(num):
    for i in range(num):
        print("跳舞。。。")
        time.sleep(0.5)
if __name__ == '__main__':
    # 以元組形式傳參
    s1 = multiprocessing.Process(target=sing, args=('小明', 3))
    # 以字典形式傳參
    d1 = multiprocessing.Process(target=dance, kwargs={"num": 5, })
    s1.start()
    d1.start()

主進(jìn)程結(jié)束后不會(huì)再繼續(xù)執(zhí)行子進(jìn)程中剩余的工作
work_process = multiprocessing.Process(target=work, daemon=True)

import os
import multiprocessing
def copy_file(file_name, source_dir, dest_dir):
    # 1 拼接源文件路徑和目標(biāo)文件路徑
    source_path = source_dir + '\\' + file_name
    dest_path = dest_dir + '\\' + file_name
    # 2 打開源文件和目標(biāo)文件
    with open(source_path, 'rb') as source_file:
        with open(dest_path, 'wb') as dest_file:
            # 3 循環(huán)讀取源文件到目標(biāo)路徑
            while True:
                data = source_file.read(1024)
                if data:
                    dest_file.write(data)
                else:
                    break
if __name__ == '__main__':
    # 1 定義源文件夾和目標(biāo)文件夾
    source_dir = r'E:\TCT\TIFF_tran\pos_1'
    dest_dir= r'F:\目標(biāo)文件夾'

    # 2.創(chuàng)建目標(biāo)文件夾
    try:
        os.mkdir(dest_dir)
    except:
        print("目標(biāo)文件夾已經(jīng)存在")
    # 3.讀取源文件夾的文件列表
    file_list = os.listdir(source_dir)
    # 4.遍歷文件列表實(shí)現(xiàn)拷貝
    for file_name in file_list:
        # copy_file(file_name, source_dir, dest_dir)
        # 5.使用多進(jìn)程實(shí)現(xiàn)多任務(wù)拷貝
        sub_process = multiprocessing.Process(target=copy_file, args=(file_name, source_dir, dest_dir))
        sub_process.start()

#線程
import os
import threading
def copy_file(file_name, source_dir, dest_dir):
    # 1 拼接源文件路徑和目標(biāo)文件路徑
    source_path = source_dir + '\\' + file_name
    dest_path = dest_dir + '\\' + file_name
    # 2 打開源文件和目標(biāo)文件
    with open(source_path, 'rb') as source_file:
        with open(dest_path, 'wb') as dest_file:
            # 3 循環(huán)讀取源文件到目標(biāo)路徑
            while True:
                data = source_file.read(1024)
                if data:
                    dest_file.write(data)
                else:
                    break
if __name__ == '__main__':
    # 1 定義源文件夾和目標(biāo)文件夾
    source_dir = r'F:\迅雷下載\視頻-智能機(jī)器人從0到1系統(tǒng)入門課程\視頻'
    dest_dir= r'F:\目標(biāo)文件夾'

    # 2.創(chuàng)建目標(biāo)文件夾
    try:
        os.mkdir(dest_dir)
    except:
        print("目標(biāo)文件夾已經(jīng)存在")
    # 3.讀取源文件夾的文件列表
    file_list = os.listdir(source_dir)
    # 4.遍歷文件列表實(shí)現(xiàn)拷貝
    for file_name in file_list:
        # copy_file(file_name, source_dir, dest_dir)
        # 5.使用多線程實(shí)現(xiàn)多任務(wù)拷貝
        sub_thread = threading.Thread(target=copy_file, args=(file_name, source_dir, dest_dir))
        sub_thread.start()
   for file_name in file_list:
       sub_thread.join()
        sub_thread.join()#主線程等待所有線程結(jié)束才會(huì)結(jié)束