第24天：Python datetime 和 time

import datetime#当前日期和时间print(datetime.datetime.now())2019-09-30 22:19:37.582514
#获取指定时间datetest = datetime.datetime(2019,9,30,22,22,0)print(datetest)2019-09-30 22:22:00
#获取日期的年月日时分秒print(str(datetest.year)+"-"+str(datetest.month)+"-"+str(datetest.day)+" "+str(datetest.hour)+":"+str(datetest.minute)+":"+str(datetest.second))2019-9-30 22:22:0

import datetimedt1 = datetime.datetime.fromtimestamp(10000)dt2 = datetime.datetime.fromtimestamp(time.time())
print(dt1)print(dt2)
1970-01-01 10:46:402019-09-30 23:28:47.629210

import datetime#日期转换datestr = datetime.strptime('2019-9-30 22:10:00', '%Y-%m-%d %H:%M:%S')now = datetime.now()print(datestr)print(now.strftime('%a, %b %d %H:%M'))
2019-09-30 22:10:00Tue, Oct 01 00:02

import datetime#日期增加和减少now = datetime.datetime.now()print(now)
newdate = now + datetime.timedelta(hours=10)print(newdate)
newdate = now - datetime.timedelta(days=1)print(newdate)
2019-10-01 00:23:50.1521182019-10-01 10:23:50.1521182019-09-30 00:23:50.152118

import timeprint ("当前时间戳为:", time.time())
当前时间戳为: 1569770357.6496012

import timedef calculateTime():    item = 1    for i in range(1,100000):        item = item + i    return item
startTime = time.time()result = calculateTime()endTime = time.time()print('计算结果：'+ str(result))print('执行时间：'+ str(endTime - startTime))
计算结果：4999950001执行时间：0.020943403244018555

import timefor i in range(2):    print('one')    print(time.time())    time.sleep(1)    print('two')    print(time.time())    time.sleep(1)print('运行完成')
one1569772121.6350794two1569772122.637142one1569772123.639813two1569772124.6423109运行完成