Chapter 7.9, Problem 25CP

Program Plan Intro

List:

• • A list is an object that has sequence of elements.
• • The contents of the list can be changed at any point of time, so lists in Python are mutable.
• • Lists support various additional operations like “append()”, “insert()”, “remove()”, “del()”, etc.
• • Lists have a dynamic size.
• • Lists store elements of same type, i.e. lists are homogenous.
• • List elements are enclosed by square brackets.

Syntax:

The syntax to create a list is as follows:

List_name = [element1, element2,…, elementn]

Explanation:

Here,

• • “List_name” specifies the list name.
• • “element1, element2, and elementn” indicate the list elements.

Example program:

Consider the below example that creates a list and prints the list.

#Declare a list with numbers

list_ex = [1, 2, 3, 4]

#Print the list

print(list_ex)

Sample Output:

[1, 2, 3, 4]

Program explanation:

In the above code,

• • “list_ex” represents a list having integers as its elements.
• • Then, the list “list_ex” is printed using “print()” function.

Tuple:

• • Tuple is an object that has immutable sequence of elements.
• • The contents of the tuple cannot be altered once it is created. Therefore, tuples in Python are immutable.
• • Tuples have a static size.
• • The elements of tuples can be of various types, i.e. tuples are heterogeneous.
• • Elements in the tuple are enclosed by parenthesis.

Syntax:

In python, a tuple is created using the below format.

#Create a tuple

Tuple_name = (element1, element2, …, elementn)

Explanation:

• • “Tuple_name” specifies the tuple name.
• • “element1, element2, and elementn” indicate the tuple elements.

Example program:

Consider the below example that creates a tuple and prints the tuple.

#Declare a tuple with numbers, strings

tuple_ex = [1, 'Joe', 'Tom', 4]

#Print the tuple

print(tuple_ex)

Sample Output:

[1, 'Joe', 'Tom', 4]

Program explanation:

In the above code,

• • “tuple_ex” represents a tuple having integers and strings as its elements.
• • Then, the tuple “tuple_ex” is printed using “print()” function.