003_001 Python 计算昨天和

#encoding=utf-8
print '中国'
import time
#一些函数 time

print time.time()

print time.gmtime()

print time.asctime(time.gmtime())

print time.localtime()

print time.strftime('%Y%m%d %H:%M:%S+%z').decode('gbk')
for i in range(2):

time.sleep(0.5)

print  i
#类datetime

import datetime

print datetime.date.today()

print datetime.datetime.now().time()

print datetime.datetime.now()
today = datetime.date.today()

next_year = today.replace(year = today.year + 1).strftime("%Y.%m.%d")

print next_year
print datetime.date(2000,2,29)-datetime.date(2001,2,28)
#类 decimal

import decimal

print 2.3333333345789

print decimal.Decimal(2.3333333345789)

print decimal.Decimal('2.3333333345789')
#decimal精度设置

decimal.getcontext().prec = 6 #设定本线程的精度

print decimal.Decimal(1) /decimal.Decimal(7)
#计算昨天和明天的日期
today = datetime.date.today()

yestoday = today - datetime.timedelta(days=1)

tomorrow = today + datetime.timedelta(days=1)
print 'today',today

print 'yestoday',yestoday

print 'tomorrow',tomorrow