Code Signal_练习题_Add Border

Given a rectangular matrix of characters, add a border of asterisks(*) to it.

Example

For

picture = ["abc",
           "ded"]

the output should be

addBorder(picture) = ["*****",
                      "*abc*",
                      "*ded*",
                      "*****"]

我的解答：

 永远都是最笨的方法........
 def addBorder(picture):
     for i in range(len(picture)):
         picture[i] = '*'+picture[i]+'*'
     picture.insert(0,'*'*(len(picture[0])))
     picture.append('*'*(len(picture[0])))
     return picture

膜拜大佬：

def addBorder(picture):
    l=len(picture[0])+2
    return ["*"*l]+[x.center(l,"*") for x in picture]+["*"*l]