元组的常见操作

'''
元组：
元组的创建
元组的访问
元组的遍历
'''
tuple=("apple","banana","grape","orange")
print tuple[-1]
print tuple[-2]
#orange
#grape
tuple2=tuple[1:3]
tuple3=tuple[0:-2]
tuple4=tuple[2:-2]
print tuple2
print tuple3
print tuple4
#('banana', 'grape')
#('apple', 'banana')
#()

fruit1=("apple","banana")
fruit2=("grape","orange")
tuple=(fruit1,fruit2)
print tuple
print "tuple[0][1]=",tuple[0][1]
print "tuple[1][1]=",tuple[1][1]
#(('apple', 'banana'), ('grape', 'orange'))
#tuple[0][1]= banana
#tuple[1][1]= orange


#元组打包
tuple=("apple","bananna","grape","orange")
#解包
a,b,c,d=tuple
print a,b,c,d
#>>>apple bananna grape orange

#元组的只读性
tuple = ("apple","banana","grape","orange")
#tuple[0]="a"

#特殊元组，当元组元素只有一个时，需要在最后面加一个逗号以区别圆括号和元组
t=("apple",)
print type(t)
print tuple[-1]
print tuple[-2]
#越界报错
#print tuple[-5]


#使用range()遍历循环
tuple=(("apple","banana"),("grape","orange"),("watermelon",),("grapeful",))
for i in range(len(tuple)):
    print "tuple[%d]"%i,"",
    for j in range(len(tuple[i])):
        print tuple[i][j],"",
    print
#使用map()循环遍历
k=0
for a in map(None,tuple):
    print "tuple[%d]:"%k,"",
    for x in a:
        print x,"",
    print
    k+=1