公用函数与模块

  
    

   
     
   
      1 
   
     #
   
     ! /usr/bin/env python
   
     

   
      2 
   
      
   
     

   
      3 
   
     def
   
      fib(n):

   
      4 
   
      a,b 
   
     =
   
      0,
   
     1
   
     

   
      5 
   
      
   
     while
   
     (b 
   
     <
   
      n):

   
      6 
   
      
   
     print
   
      b

   
      7 
   
      a,b 
   
     =
   
      b,a
   
     +
   
     b

   
      8 
   
      

   
      9 
   
     def
   
      fib2(n):

   
     10 
   
      a,b 
   
     =
   
      0,
   
     1
   
     

   
     11 
   
      result 
   
     =
   
      []

   
     12 
   
      
   
     while
   
     (b
   
     <
   
     n):

   
     13 
   
      result.append(b)

   
     14 
   
      a,b 
   
     =
   
      b,a
   
     +
   
     b

   
     15 
   
      
   
     return
   
      result
  
    

save the file as fibo.py, then enter python enviroment as below:

E:\PyTest>python

Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)] on

win32

Type "help", "copyright", "credits" or "license" for more information.

>>> import fibo

>>> fibo.fib(20)

1

1

2

3

5

8

13

>>> from fibo import *

>>> fib(20)

1

1

2

3

5

8

13

 

Pay attention to the difference between import modulename and from modulename import module