The only difference between tuples and lists is that lists can be changed, tuples can't be changed, and other functions are the same as lists.

Two ways to create tuples

First kind

ages = (11, 22, 33, 44, 55)

Second kinds

ages = tuple((11, 22, 33, 44, 55))

If there is only one element in the meta-ancestor, a comma is needed, otherwise it becomes a string.

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In [1]: t = (1)

In [2]: t
Out[2]: 1

In [3]: type(t)
Out[3]: int

In [4]: t = (1,)

In [5]: t
Out[5]: (1,)

In [6]: type(t)
Out[6]: tuple

The method of tuple

View the number of occurrences of elements in the list

count(self, value):

attribute	describe
value	Element value

>>> ages = tuple((11, 22, 33, 44, 55))
>>> ages
(11, 22, 33, 44, 55)
>>> ages.count(11)
1

Find the location of elements in tuples

index(self, value, start=None, stop=None):

attribute	describe
value	Element value
start	Starting position
stop	End position

>>> ages = tuple((11, 22, 33, 44, 55))
>>> ages.index(11)
0
>>> ages.index(44)
3

List nesting

>>> T = (1,2,3,4,5)
>>> (x * 2 for x in T)
<generator object <genexpr> at 0x102a3e360>
>>> T1 = (x * 2 for x in T)
>>> T1
<generator object <genexpr> at 0x102a3e410>
>>> for t in T1: print(t)
... 
2
4
6
8
10

Tuple nesting modification

Elements of tuples are immutable, but elements of elements of tuples may be immutable.

>>> tup=("tup",["list",{"name":"ansheng"}])
>>> tup
('tup', ['list', {'name': 'ansheng'}])
>>> tup[1]
['list', {'name': 'ansheng'}]
>>> tup[1].append("list_a")
>>> tup[1]
['list', {'name': 'ansheng'}, 'list_a']

The element of a tuple itself is immutable, but it can be modified if the element of a tuple is a list or dictionary.

Slices modify immutable types in situ

>>> T = (1,2,3)
>>> T = T[:2] + (4,)
>>> T
(1, 2, 4)

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