Tuple is one of the built-in data types in Python. A Python tuple is a sequence of comma separated items, enclosed in parentheses (). The items in a Python tuple need not be of same data type.
Following are some examples of Python tuples −
tup1 = ("Rohan", "Physics", 21, 69.75)
tup2 = (1, 2, 3, 4, 5)
tup3 = ("a", "b", "c", "d")
tup4 = (25.50, True, -55, 1+2j)
The empty tuple is written as two parentheses containing nothing −
tup1 = ();
To write a tuple containing a single value you have to include a comma, even though there is only one value −
tup1 = (50,);
Following are the points to be noted −
To access values in tuple, use the square brackets for slicing along with the index or indices to obtain value available at that index. For example −
tup1 = ('physics', 'chemistry', 1997, 2000);
tup2 = (1, 2, 3, 4, 5, 6, 7 );
print ("tup1[0]: ", tup1[0]);
print ("tup2[1:5]: ", tup2[1:5]);
When the above code is executed, it produces the following result −
tup1[0]: physics tup2[1:5]: [2, 3, 4, 5]Updating Tuples
Tuples are immutable which means you cannot update or change the values of tuple elements. You are able to take portions of existing tuples to create new tuples as the following example demonstrates −
tup1 = (12, 34.56);
tup2 = ('abc', 'xyz');
# Following action is not valid for tuples
# tup1[0] = 100;
# So let's create a new tuple as follows
tup3 = tup1 + tup2;
print (tup3);
When the above code is executed, it produces the following result −
(12, 34.56, 'abc', 'xyz')Delete Tuple Elements
Removing individual tuple elements is not possible. There is, of course, nothing wrong with putting together another tuple with the undesired elements discarded.
To explicitly remove an entire tuple, just use the del statement. For example −
tup = ('physics', 'chemistry', 1997, 2000);
print (tup);
del tup;
print ("After deleting tup : ");
print (tup);
This produces the following result. Note an exception raised, this is because after del tup tuple does not exist any more −
('physics', 'chemistry', 1997, 2000)
After deleting tup :
Traceback (most recent call last):
File "test.py", line 9, in <module>
print (tup);
NameError: name 'tup' is not defined
Python Tuple Operations
In Python, Tuple is a sequence. Hence, we can concatenate two tuples with + operator and concatenate multiple copies of a tuple with "*" operator. The membership operators "in" and "not in" work with tuple object.
Python Expression Results Description (1, 2, 3) + (4, 5, 6) (1, 2, 3, 4, 5, 6) Concatenation ('Hi!',) * 4 ('Hi!', 'Hi!', 'Hi!', 'Hi!') Repetition 3 in (1, 2, 3) True MembershipEven if there is only one object in a tuple, you must give a comma after it. Otherwise, it is treated as a string.Indexing, Slicing, and Matrixes
Because tuples are sequences, indexing and slicing work the same way for tuples as they do for strings. Assuming following input −
L = ('spam', 'Spam', 'SPAM!')
Python Expression Results Description L[2] 'SPAM!' Offsets start at zero L[-2] 'Spam' Negative: count from the right L[1:] ['Spam', 'SPAM!'] Slicing fetches sections No Enclosing Delimiters
Any set of multiple objects, comma-separated, written without identifying symbols, i.e., brackets for lists, parentheses for tuples, etc., default to tuples, as indicated in these short examples −
print ('abc', -4.24e93, 18+6.6j, 'xyz');
x, y = 1, 2;
print ("Value of x , y : ", x,y);
When the above code is executed, it produces the following result −
abc -4.24e+93 (18+6.6j) xyz Value of x , y : 1 2Built-in Functions with Tuples
Following are the built-in functions we can use with tuples −
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4