C..2 tuple

list とよく似ているが、immutable である。

>>> x=()
>>> x
()

>>> x=(1)
>>> x
1
>>> x=(1,)
>>> x
(1,)

>>> x=(1,'two')
>>> x
(1, 'two')
>>> x[0]
1
>>> x(1)
'two'

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

>>> x=(1,2)
>>> x
(1, 2)

>>> x.append(3)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'tuple' object has no attribute 'append'