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Concept explainers
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
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.
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Chapter 7 Solutions
Starting Out with Python (4th Edition)
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