Which of the following data types is immutable in Python?
Which of the following data guys is immutable in the context of Python programming language? Here are the options given below:-
Lists
My_list = [1, 2, 3]
My_list.append(4) # my_list is now [1, 2, 3, 4]
Dictionaries
My_dict = {‘a’: 1, ‘b’: 2}
My_dict[‘c’] = 3 # my_dict is now {‘a’: 1, ‘b’: 2, ‘c’: 3}
Sets
My_set = {1, 2, 3}
My_set.add(4) # my_set is now {1, 2, 3, 4}
Tuple
My_tuple = (1, 2, 3)
# Any attempt to modify my_tuple will result in an error
# For example: my_tuple[0] = 4 will raise a TypeError
In the context of Python programming language, the option which is right regarding immutable data type in a python programming language is option 4 which refers to the tuple. A tuple is an ordered, immutable collection of elements in the Python programming language. Here are some key points given about the tuple:-
Creating a tuple
Tuples can be created by placing a sequence of values separated by the commas within the parentheses ():
My_tuple = (1, 2, 3)
Empty_tuple = ()Singleton_tuple = (1,) # Note the comma
Accessing the elements
The elements in a tuple can be accessed by using indexing and slicing.
Print(my_tuple[0]) # Output: 1
Print(my_tuple[1:3]) # Output: (2, 3)Immutability
Tuples cannot be changed or even modified after creation. If you ever try to modify, change, add, or remove an element, it would result in a Typerror.
My_tuple[0] = 4 # Raises TypeError
Packing and unpackingPacking
Packed_tuple = 1, 2, 3
# packed_tuple is (1, 2, 3)UnPacking
A, b, c = packed_tuple
# a is 1, b is 2, c is 3Nesting tuples
The tuples can also contain other tuples as elements which would allow you to nest:
Nested_tuple = (1, (2, 3), 4)
# Access nested elementsPrint(nested_tuple[1][0]) # Output: 2Uses of Tuples
Fixed collection
When you need to ensure that the collection of items should not be changed or modified.
Function returns
It is very useful for returning multiple values from a particular function.
Dictionaries keys
The Tuples can be used as the keys in the dictionaries because they are immutable.
Example usage
Here is the example given below :
Def get_coordinates():
Return (42.3601, -71.0589) # Latitude and Longitude of Boston
Coordinates = get_coordinates()