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 ', ' W3cschool ', 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 ', ' W3cschool ', 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 ', ' W3cschool ', 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:na Me ' tup ' is 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.

Python Expressions	Results	Description
Len ((1, 2, 3))	3	Count the number of elements
(1, 2, 3) + (4, 5, 6)	(1, 2, 3, 4, 5, 6)	Connection
[' hi! '] * 4	[' hi! ', ' hi! ', ' hi! ', ' hi! ']	Copy
3 in (1, 2, 3)	True	Whether the element exists
For x in (1, 2, 3): Print x,	1 2 3	Iteration

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 ', ' W3cschool ')

Python Expressions	Results	Description
L[2]	' w3cschool! '	Reading a third element
L[-2]	' Taobao '	Read the second last element of the inverse
L[1:]	(' Taobao ', ' w3cschool! ')	Intercepts elements, starting from the second after all elements.

Run the following example:

>>> L = (' Google ', ' Taobao ', ' W3cschool ') >>> l[2] ' w3cschool ' >>> l[-2] ' Taobao ' >>> L [1:] (' Taobao ', ' W3cschool ')

Tuple built-in functions

The Python tuple contains the following built-in functions

Serial Number	Method and Description	Example
1	Len (tuple) Counts the number of tuple elements.
2	Max (tuple) Returns the element's maximum value in a tuple.
3	MIN (tuple) Returns the element minimum value in a tuple.
4	Tuple (SEQ) Converts a list to a tuple.	>>> list1= [' Google ', ' Taobao ', ' w3cschool ', ' Baidu ']>>> tuple1=tuple (list1) >>> tuple1 (' Google ', ' Taobao ', ' w3cschool ', ' Baidu ')

Python3 Meta-Group