反转序列并输出的方法（暂时五种）

x="123456789"

y=[1,2,3,4,5,6,7,8,9]

n=len(x)

m=len(y)

#one

for i in range(m-1,-1,-1):

    print y[i]

for i in range(n-1,-1,-1):

    print x[i]

 

#two

y.reverse()

for i in y:

    print i

 

#three

for i in range(-1,-m):

    print y[i]

for i in range(-1,-n):

    print x[i]

 

#four

map(lambda i: y[i],range(m-1,-1,-1))

map(lambda i: x[i],range(n-1,-1,-1))

 

#five

for i in reversed(y):

    print i