python的datetime、random和os模块使用方法

import datetime
# print(datetime.date.today())
# print(datetime.datetime.today())
# res=datetime.datetime.today()+datetime.timedelta(hours=-10,minutes=-20)
# print(res.time())
# print(res.date())
# print(res.timestamp())
# print(res.strftime('%Y-%m %H:%M:%S'))
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# import random
# # for i in range(10):
# # # #     print(random.random())
# s='abcdef'
# print(random.choice(s))
# print(random.sample(s,3))
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import os
# print(os.path.abspath('.'))#显示绝对路径
# print(os.listdir())#显示当前模块的文件名称
# print(os.getcwd())#显示当前路径

# print(random.uniform(8,9))