python字符串和time互转与时间的加减另加uuid

# -*-coding:utf-8 -*-
__author__ = "ZJL"

import  uuid,time,datetime

#uuid4产生32位随机字母加数字
print(str(uuid.uuid4()).replace("-",""))
#uuid3产生基于名字的MD5散列值
print(str(uuid.uuid3(uuid.NAMESPACE_DNS,"username")).replace("-",""))

#time转字符串
time_num = time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))
print(time_num)

#字符串转time
t = time.strptime(time_num, '%Y-%m-%d %H:%M:%S')
y,m,d,H,M,S = t[:6]
print(t)
print(datetime.datetime(y,m,d,H,M,S))

#时间的加减
now_time = datetime.datetime.now()
#当前时间加半小时
yes_time = now_time + datetime.timedelta(hours=+0.5)
#比较时间大小
if now_time>yes_time:
    print("ok")
else:
    print("no")
#当前时间减一天
# yes_time = now_time + datetime.timedelta(days=-1)
yes_time_nyr = yes_time.strftime('%Y-%m-%d %H:%M:%S')
print(yes_time_nyr)

结果：



import time, datetime
#一个月前
today1 = datetime.datetime.today()
astmonth = datetime.datetime(today1.year, (today1.month - 1), today1.day, today1.hour, today1.minute,today1.second)