日期，持久化的使用

一、日期和持久化

import datetime

#年月日
today = datetime.date.today()
print(today)
print(today.year)
print(today.day)
print(today.weekday())

#时间
now = datetime.datetime.now()
print(now.year)
print(now.second)

#字符串转换
s = '2018-3-15'
t = datetime.datetime.strptime(s, '%Y-%m-%d')
print(t)

#时间转换为字符串
now = datetime.datetime.now().strftime('%Y/%m/%d/%H/%M/%S')
print(now)

#pickle的使用
import pickle

person = {'name': 'Tom', 'age': 20}
s = pickle.dumps(person)

p = pickle.loads(s)
print(p)

pickle.dump(person, open('1.db', 'wb'))

p = pickle.dump(open('1.db', 'rb'))
print(p)