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
[python]  
<span style="font-size:18px">from datetime import datetime  
now = datetime.now()  
print now</span>  
 
 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
[python]  
<span style="font-size:18px">from datetime import datetime  
now = datetime.now()  
  
print now.month  
print now.day  
print now.year</span>  
 
 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
[python]  
<span style="font-size:18px">from datetime import datetime  
now = datetime.now()  
  
print str(now.month)+"/"+str(now.day)+"/"+str(now.year)</span>  
 
 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
[python]  
<span style="font-size:18px">from datetime import datetime  
now = datetime.now()  
  
print str(now.hour)+":"+str(now.minute)+":"+str(now.second)</span>  
 
 第五节
    1 练习：把日期和时间两个连接起来输出
[python]  
<span style="font-size:18px">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)</span>

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