线程池的基本使用

# import time
# #使用单线程串行方式执行

# def get_page(str):
#     print("正在下载：", str)
#     time.sleep(2)
#     print("下载成功：", str)

# name_list = ["aa","bb","cc","dd"]

# start_time = time.time()

# for i in range(len(name_list)):
#     get_page(name_list[i])

# end_time = time.time()
# print('%d second '% (end_time-start_time))



import time
#导入线程池模块对应的类
from multiprocessing.dummy import Pool
#使用线程池串行方式执行

start_time = time.time()

def get_page(str):
    print("正在下载：", str)
    time.sleep(2)
    print("下载成功：", str)

name_list = ["aa","bb","cc","dd"]
#实例化一个线程池对象
pool = Pool(4)

#将列表中每一个列表元素传递给get_page进行处理
pool.map(get_page,name_list)

end_time = time.time()
print(end_time-start_time)

# for i in range(len(name_list)):
#     get_page(name_list[i])

# end_time = time.time()
# print('%d second '% (end_time-start_time))