python010 Python3 Tuple

Python3 Meta-Group
A Python tuple is similar to a list, except that the elements of a tuple cannot be modified.
Tuples use parentheses, and the list uses square brackets.
Tuple creation is simple, just add elements in parentheses and separate them with commas.
The following example:

Tup1 = (' Google ', ' Tencent ', 1997, n); tup2 = (1, 2, 3, 4, 5); tup3 = "A", "B", "C", "D";

Create an empty tuple

Tup1 = ();

When you include only one element in a tuple, you need to add a comma after the element

Tup1 = (50,);

Tuples are similar to strings, and subscript indexes start at 0 and can be intercepted, combined, and so on.

accessing tuples
Tuples can use the subscript index to access the values in the tuple, as in the following example:

#!/usr/bin/python3tup1 = (' Google ', ' Tencent ', 1997, $) tup2 = (1, 2, 3, 4, 5, 6, 7) print ("tup1[0]:", tup1[0]) print ( "Tup2[1:5]:", Tup2[1:5])

The result of the above example output:

TUP1[0]: Googletup2[1:5]: (2, 3, 4, 5)

modifying tuples
The element values in the tuple are not allowed to be modified, but we can combine the tuples with the following example:

#!/usr/bin/python3tup1 = (34.56); tup2 = (' abc ', ' XYZ ') # The following modification of tuple element operations is illegal. # Tup1[0] = 100# Create a new tuple Tup3 = Tup1 + tup2;print (TUP3)

The result of the above example output:

(34.56, ' abc ', ' XYZ ')

Delete a tuple
element values in tuples are not allowed to be deleted, but we can use the DEL statement to delete an entire tuple, as in the following example:

#!/usr/bin/python3tup = (' Google ', ' Tencent ', 1997, +) print (tup) del tup;print ("Deleted tuple tup:") print (TUP)

When the above instance tuple is deleted, the output variable will have exception information, the output is as follows:

Deleted tuple Tup:traceback (most recent call last): File "test.py", line 8, in <module>print (tup) nameerror:name ' Tup ' I s not defined

Tuple operators

As with strings, you can use the + and * numbers to perform operations between tuples. This means that they can be combined and copied, and a new tuple is generated after the operation.

Tuple index, intercept
Because tuples are also a sequence, we can access the elements at the specified location in the tuple, or we can intercept an element in the index as follows:
Meta-group:

L = (' Google ', ' Taobao ', ' Tencent ')

Run the following example:

>>> L = (' Google ', ' Taobao ', ' Tencent ') >>> l[2] ' Tencent ' >>> l[-2] ' Taobao ' >>> l[1:] (' Taobao ', ' Tencent ')

Tuple built-in functions

The Python tuple contains the following built-in functions

python010 Python3 Tuple