Python练习题4

将字符串ilovechina反转

a='ilovechina'
str=[]
i=j=0
while 1:
        if i<=len(a)-1:
            str.append(a[i])
            i+=1
        else:break
while 1:
        try:
            print(str.pop(),end='')
        except IndexError:
            break