Day -10 tuple与List

tuple 可放任意物件，但不可变 ;

tuple用法如下

建立多个元素

tupleSample = ("Groucho","Sam")
print(empty_tuple)

emptySample = "Sandy","Paul"
print(empty_tuple)


('Groucho', 'Sam')
('Sandy', 'Paul', 'Rose')

为字元找寻字元为第几个

vowels = ('a', 'e', 'i', 'o', 'i', 'u')
index = vowels.index('e')
print('The index of e:', index)
index = vowels.index('i')
print('The index of i:', index)

The index of e: 1
The index of i: 2

印出格式

print(type(vowels))
<class 'tuple'>

一次对应多个对应变数，称为拆包(unpacking)

marx_tuple = ( 'Groucho' , 'Chico' , 'Harpo')
a, b , c = marx_tuple

print(a)
print(b)
print(c)

tuple 值直接对调(SWAP)，不用暂存变数

password = 'Hello' , 
icecream = 'Mary' ,
password , icecream = icecream , password

print(password)
print(icecream)

('Mary',)
('Hello',)

使用tuple()函式，转换成tuple

marx_list = ['Groucho' , 'Chico' , 'Harpo'] 
print(tuple(marx_list))
('Groucho', 'Chico', 'Harpo')

print(('Groucho' ,)+ ('Chico' , 'Harpo'))
('Groucho', 'Chico', 'Harpo')

用 * 乘号来运算显示多笔

('yeah',) * 3
print(('yeah',) * 3)

('yeah', 'yeah', 'yeah')

比较 tuple

a = (7,2)
b = (7,2,9)
a == b
print(a == b)

使用range()

range_tuple = tuple(range(10))
print(type(range_tuple))
print(range_tuple)
print(range_tuple[:5:2])
(0, 2, 4)

List 可放任意物件，可变。

List用法如下

List 相加有两种方式，t1内存记忆体不同：


t1 = ('one','two','three')
t2 = ('four')
print(id(t1))
print(t1 + t2)

t1 += t2
print(t1) 
print(id(t1))

('one', 'two', 'three', 'four')
47210502568192
('one', 'two', 'three', 'four')
47210502433104

tuple 与串列比较
tuple 通常可以取代List，但可操作的功能会少很多，且不能修改。
tuple优点: