Python之列表推导式List comprehensions例解

Python supports a concept called "list comprehensions". It can be used to construct lists in a very natural, easy way, like a mathematician is used to do.

常见python编程方法

  
    

   
     #
   
     the first try
   
     
#
   
     =============================
   
     

   
     number 
   
     =
   
      range(
   
     10
   
     )
size 
   
     =
   
      len(number)
event 
   
     =
   
      []
i 
   
     =
   
      0

   
     while
   
      i 
   
     <
   
      size:
 
   
     if
   
      i
   
     %
   
     2
   
      
   
     ==
   
      0:
 event.append(i)
 i 
   
     +=
   
      
   
     1
   
     

   
     print
   
      event
  
    

By using Python List comprehensions as below:

  
    

   
     #
   
     improve
   
     
#
   
     =============================
   
     

   
     print
   
      [i 
   
     for
   
      i 
   
     in
   
      range(
   
     10
   
     ) 
   
     if
   
      i
   
     %
   
     2
   
      
   
     ==
   
      0]