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Python 3 - Tuples
Neha Kumawat
3 years ago
A tuple is a sequence of immutable Python objects. Tuples are sequences, just like lists. The main difference between the tuples and the lists is that the tuples cannot be changed unlike lists. Tuples use parentheses, whereas lists use square brackets.
Creating a tuple is as simple as putting different comma-separated values. Optionally, you can put these comma-separated values between parentheses also. For example −
tup1 = ('physics', 'chemistry', 1997, 2000)
tup2 = (1, 2, 3, 4, 5 )
tup3 = "a", "b", "c", "d"
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,)
Like string indices, tuple indices start at 0, and they can be sliced, concatenated, and so on.
Accessing Values in Tuples
To access values in tuple, use the square brackets for slicing along with the index or indices to obtain the value available at that index. For example −
#!/usr/bin/python3
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 the existing tuples to create new tuples as the following example demonstrates −
#!/usr/bin/python3
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 −
#!/usr/bin/python3
tup = ('physics', 'chemistry', 1997, 2000);
print (tup)
del tup;
print ("After deleting tup : ")
print (tup)
This produces the following result.
Note − An exception is 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
print tup;
NameError: name 'tup' is not defined
Basic Tuples Operations
Tuples respond to the &plus and * operators much like strings; they mean concatenation and repetition here too, except that the result is a new tuple, not a string.
In fact, tuples respond to all of the general sequence operations we used on strings in the previous chapter.
Indexing, Slicing, and Matrixes
Since tuples are sequences, indexing and slicing work the same way for tuples as they do for strings, assuming the following input −
T=('C++', 'Java', 'Python')
No Enclosing Delimiters
No enclosing Delimiters is 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.
Built-in Tuple Functions
Python includes the following tuple functions −
Compares elements of both tuples.
Gives the total length of the tuple.
Returns item from the tuple with max value.
Returns item from the tuple with min value.
Converts a list into tuple.