Python-tuple

关于元组的理解：②元组除了被重新定义、创建外，③元组不可变，但是①元组内容如果是可变的，其内容可变。

 

①

>>> sq = (1,2,[3,4])
>>> sq[2][0] = 5 #[3,4][0]
>>>

②

>>> sq = (1,2,[3,4])
>>> sq[2][0] = 5 #[3,4][0]
>>> sq[0]=5
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment
>>> sq=(1)
>>> sq
1
>>>

③

>>> sq = (1,2,[3,4])
>>> sq[2][0] = 5 #[3,4][0]
>>> sq[0]=5
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'tuple' object does not support item assignment
>>>