函数的声明

函数的声明

导入时间模块

In [2]: import time

In [3]: time.ctime(time.time())

Out[3]: 'Wed Apr  5 15:16:26 2017'

In [4]: time.time()

Out[4]: 1491376668.733707

In [5]: time.ctime(time.time())        //转换时间格式

Out[5]: 'Wed Apr  5 15:18:07 2017'

...:     print "hello world"

...:

In [7]: myprint()                //调用myprint（）函数

hello world

In [8]: print myprint()

hello world

None

函数

In [1]: def f():    //定义函数f()

...:     a= 1

...:     b=3

...:     c=2

...:     return a,b,c  //返回a，b,c的值，省略了括号

...:

In [2]: f()

Out[2]: (1, 3, 2)

In [3]: a,b,c =f()       //将f（）函数的值依次赋给a,b,c

In [4]: print a,b,c

1 3 2

In [5]: def abs(x):         //定义绝对值函数

...:     if x>=0:

...:         return x       //当x为正数时，返回x的值

...:     else:

...:         return -x       //否则返回-x的值

...:

In [6]: abs(2)

Out[6]: 2

In [7]: abs(-5)

Out[7]: 5

In [8]: def abs(x):

...:     if x>=0:

...:         print x

...:     else:

...:         print -x

...:

In [9]: abs(-5)

5

In [10]: print abs(-13)

13                                //

None                               //

In [12]: def power(x):              //定义3次方函数

....:     return x*x*x

....:

In [13]: power(2)

....:     return x**3

....:                        #In [20]: def power(x):

Out[13]: 8                      #....:     return x**3

#....:

In [14]: power(3)               #In [21]: power(3)

Out[14]: 27                     #Out[21]: 27

--------------------

....:     return x if x>=0 else -x  //x>=0时返回x，否则返回-x

....:

In [16]: abs(-5)

Out[16]: 5

In [17]: abs(5)

Out[17]: 5

In [22]: def info(name,age=18,address="xi'an"):

....:     print name,age,address

....:

In [23]: info("hzy")         //传递参数

hzy 18 xi'an

In [24]: info ("hzy",20)

hzy 20 xi'an

In [16]: def add(*args):

....:     sum =0

....:     for i in args:

....:         sum =sum +i

....:     return sum

....:

In [17]: add(1,2,3,4)

Out[17]: 10

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