Python 进阶 —— 重访 tuple

1. 单元素？(3) ⇒ (3, )

>> l = [3]
>> type(l)
list

>> t = (3)
>> type(t)
int

>> l = [[3]]
>> l
[[3]]

>> t = ((3, 4))
>> t
(3, 4)

>> t = (3, )
>> t = ((3, ), )

2. tuple 可变乎？

+

+=

>> t = (1, 2)
>> t + (3, 4)
(1, 2, 3, 4)

>> t += (3, 4)
>> t
(1, 2, 3, 4)

3. tuple 可变乎？（二）

>> t = ([1, 2], 3, 4)
>> t[0][1] = 20
>> t
([1, 20], 3, 4)

4. 位置参数（positional parameters）与 tuple

>> def foo(*args):
>>  print(args)
>> foo(1)
(1,)