Python 入门教程 4 ---- Date and Time

 第一节

    1 介绍得到当前的时间datetime.now()

    2 练习

       1 设置变量now的值为datetime.now()

       2 打印now的值

from datetime import datetime
now = datetime.now()
print now

 第二节

     1 介绍从datetime.now得到的信息中提取出year,month等

     2 练习: 从datetime.now中得到的信息中提取出year,month,day

from datetime import datetime
now = datetime.now()

print now.month
print now.day
print now.year

 第三节

    1 介绍把输出日期的格式转化为mm//dd//yyyy，我们利用的是+来转化

    2 练习：打印当前的日期的格式为mm//dd//yyyy

from datetime import datetime
now = datetime.now()

print str(now.month)+"/"+str(now.day)+"/"+str(now.year)

 第四节

    1 介绍把输出的时间格式化为hh:mm:ss

    2 练习：打印当前的时间的格式为hh:mm:ss

from datetime import datetime
now = datetime.now()

print str(now.hour)+":"+str(now.minute)+":"+str(now.second)

 第五节

    1 练习：把日期和时间两个连接起来输出

from datetime import datetime
now = datetime.now()

print str(now.month) + "/" + str(now.day) + "/" + str(now.year) + " "\
+str(now.hour) + ":" + str(now.minute) + ":" + str(now.second)