Python Tuples: In Python, a tuple is a collection which is ordered and unchangeable. It is another sequence data type which is similar to list. A tuple consists of no.of values separated by commas. The main difference between Python tuples and list are, lists are enclosed in brackets ([]) and their elements and sizes can be changed. While tuples are enclosed in parentheses (()) and cannot be updated. Tuples can be thought of as read-only lists.
Example
thistuple=("mango","grape","lemon")
print(thistuple)
Output: (‘mango’, ‘grape’,’lemon’)
Python Tuples
Access the Python tuple Items
You can access the python tuple items by referring to the index number. And the indexing value must be an integer. So that we cannot change into other values. It will give us TypeError.
Example
thistuple=("mango", "grape", "lemon")
print(thistuple[1])
Output: grape
Change tuple values
Once python tuple is changed, you cannot change its values. Unlike the lists, lists are immutable.
Example
thistuple=("mango","grape","lemon")
thistuple[1]="papaya"#It will remains the same
print(thistuple)
Output: (‘mango’, ‘grape’,’lemon’)
Slicing of tuples
We can access a range of elements by using the slicing operator (:). Slicing can be best visualized by considering the index to be between the elements as shown below. So if we want to access a range, we need the index that will slice the portion from the tuple.
Example
my_tuple = ('f','r','e','s','h','e','r','s','n','o','w')
# elements 2nd to 4th
# Output: ('e', 's', 'h')
print(my_tuple[1:4])
# elements beginning to 2nd
# Output: ('f', 'r')
print(my_tuple[:-7])
# elements 8th to end
# Output: ('s','n','o', 'w')
print(my_tuple[7:])
# elements beginning to end
print(my_tuple[:])
Output
(‘r’, ‘e’, ‘s’)
(‘f’, ‘r’, ‘e’, ‘s’)
(‘s’, ‘n’, ‘o’, ‘w’)
(‘f’, ‘r’, ‘e’, ‘s’, ‘h’, ‘e’, ‘r’, ‘s’, ‘n’, ‘o’, ‘w’)
Loop through a tuple
You can loop through then tuple items by using for loop
Example
tuple=('aecd',584,2.23,'freshersnow',60.2)
tinytuple = (123,'merry')
print tuple #Prints complete list
print tuple[0] # Prints first element of the list
print tuple[1:3] #Prints elements starting from 2nd till 3rd
print tuple[2:] #Prints elements starting from the 3rd element
print tinytuple*2 #Prints list two times
print tuple+tinytuple #Prints concatenated lists
Output
(‘aecd’, 584,2.23,’freshersnow’,60.2) aecd (584,2.23)
(2.20,’freshersnow’,60.2)
(123,’freshersnow’,123,’freshersnow’)
(‘aecd’, 584, 2.23,’freshersnow’,60.2, 123,merry)
check if the item exists
Example
thistuple=("van","car","truck")
if "car" in thistuple: Print ("Yes,'car' is in the vehicles tuple")
Output: Yes, ‘car’ is in the vehicle’s tuple
Python Tuple Length
Example
thistuple=("van","car","truck")
print(len(thistuple))
Output: 3
Python Add items
Once a Python tuple is created, you cannot add items to it. In PythonTuples are unchangeable.
Example
thistuple=("van","car","truck")
thistuple[3]="bus" #This will raise an error
print(thistuple)
Output: ‘tuple’ object does not support the item assignment
Remove Items
Python tuple is unchangeable. So you cannot remove items from it, but you can delete the tuple completely.
Example
thistuple=("van","car","truck")
del thistuple print(thistuple)#this will raise an error because the tuple no longer exists
Output: Name Error: name ‘thistuple’ is not defined
Python tuple constructor
For making python tuple ( ) we can use tuple constructor.
Example
thistuple=tuple(("van","car","truck"))# note the double round-brackets
print(thistuple)
Output: (‘van’,’car’,’truck’)
Python Tuple Methods
In Python tuple methods, in the context of object-oriented programming, is a procedure or a function in the class. As a part of the class, a method defines the behavior of class instance. A class can have more than one method.
Python has two built-in methods that can be used in tuples.
| Method | Description |
|---|---|
| count( ) | Returns the no.of times a specified value occurs in the tuple |
| Index( ) | Searches the tuple for a specified value and returns the position where it is found. |
Example
my_tuple = ('a','p','p','l','e',)
print(my_tuple.count('p')) # Output: 2
print(my_tuple.index('l')) # Output: 3
Output
2
3
Tuple membership test
We can test if an item exists in the tuple (or) not by using the keyword in.
Example
my_tuple = ('m','a','n','g','o',)
#In operation
#Output: True
print('a' in my_tuple)
#Output: False
print('b' in my_tuple)
#Not in operation
#Output: True
print('g' not in my_tuple)
Output
True
False
False