7. 简单生成器函数，Pool 实现多进程程序，异常管理，浏览器版本帮助手册

# 声明一个生成器函数def my_func(x):    while x < 15:        x += 1        yield x

# 创建函数实例func = my_func(10)
# 使用 next 调用函数a = next(func)a = next(func)a = next(func)a = next(func)a = next(func)  # 得到 15a = next(func)  # 得到 StopIteration 异常print(a)

(表达式 for 循环变量 in 序列)

import requestsfrom multiprocessing.dummy import Poolimport time
start_time = time.perf_counter()
urls = ["https://www.csdn.net/",        "https://www.baidu.com/",        "https://www.jianshu.com/",        "https://juejin.cn/",        "https://www.zhihu.com/"]
pool = Pool(2)
pool.map(requests.get, urls)
pool.close()pool.join()print("运行完毕，耗费时间为：", time.perf_counter() - start_time)# 运行完毕，耗费时间为： 0.703510638
# 普通调用for url in urls:    requests.get(url)# 运行完毕，耗费时间为： 1.239038099

raise Exception("异常错误提示信息")

import traceback
try:    raise Exception("异常错误")except:    with open("./error.txt", "w",encoding="utf-8") as f:        f.write(traceback.format_exc())    print("异常错误写入成功！")

assert 条件表达式 , 异常提示

import logging
logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(levelname)s - %(message)s')
logging.debug("程序日志开始记录")for i in range(1, 10):    logging.debug("程序运行中，" + str(i))
logging.debug("程序结束")