元组及其基本操作

Posted 2021-11-12 tuzaizi

元组

t1 = ()
print(t1, type(t1))

结果：() <class ‘tuple‘>

　　

  参数为for可以循环的对象(可迭代对象)

t2 = tuple("123")
print(t2, type(t2))  #(‘1‘, ‘2‘, ‘3‘) <class ‘tuple‘>
t3 = tuple([1, 2, 3])
print(t3, type(t3))  #(1, 2, 3) <class ‘tuple‘>
t4 = tuple((7, 8, 9))
print(t4, type(t4))  #(7, 8, 9) <class ‘tuple‘>

　　

 思考:如何定义一个只有一个值的元组

# "Owen"
print(("Owen", ))
print(tuple([‘Owen‘]))

 常用操作
 元组有序存储
 索引取值

t = (1, 2, 3, 2, 3, 2)
print(t[1])   #2
print(t[-2])  #3

  切片

t = (1, 2, 3, 2, 3, 2)

print(id(t))  #2129098784520
nt = t[:-1:]
print(nt, id(nt))  #(1, 2, 3, 2, 3) 2129098421328

 长度（item元素个数）

t = (1, 2, 3, 2, 3, 2)

print(len(t))   #6