Python data type-Tuple (tuple)

1. Tuple
2. Tuple (tuple) is similar to list, the difference is that the elements of tuple cannot be modified
3. The elements in Tuple (tuple) are enclosed in parentheses and separated by commas
4. The element types in Tuple (tuple) can also be different
5. Also supports slicing operations
6. The index value starts from 0 and ends with -1
7. If there is only one Tuple (element), write it as (1,)

Specific code running process:

# 元组
t=('a','b','c')
t[1]=1  # 元组中的元素不能被修改
TypeError                                 Traceback (most recent call last)
<ipython-input-42-5f612c647d12> in <module>
      1 # 元组
      2 t=('a','b','c')
----> 3 t[1]=1

TypeError: 'tuple' object does not support item assignment
t=(1)
type(t)
int
t=(t,)
type(t)
tuple

# 经典的面试题
l=['A','B']
t=('a','b',l)
t[2][0]='C'   元组不能改变是指元素指向不变，如果一个元素指向一个列表，指向不变，但所指向列表中的元素可改变
('a', 'b', ['C', 'B'])
l1=['A','B']
t[2]=l1   # 元组员素本身不能被改变，如下错误提示
TypeError                                 Traceback (most recent call last)
<ipython-input-54-da6e52aa1129> in <module>
----> 1 t[2]=l1
TypeError: 'tuple' object does not support item assignment