Class 8 Python Basics Question Answer
1. What is Python?
Answer: Python is a high-level, interpreted programming language known for its readability and simplicity. It supports multiple programming paradigms, including procedural, object-oriented, and functional programming.
2. Who created Python and when was it first released?
Answer: Python was created by Guido van Rossum and was first released in 1991.
3. What is the difference between interactive mode and script mode in Python?
Answer: In interactive mode, Python code is executed line by line in an interactive environment, like the Python shell or the terminal. This allows you to quickly test small code snippets and see the results immediately. In script mode, Python code is written in a file with a .py extension and is executed as a whole. Script mode is useful for writing larger programs that need to be saved and reused. You can run Python scripts from the command line or an IDE like PyCharm or Visual Studio Code.
4. How can you display output on the screen in Python?
Answer: In Python, you can use the print() function to display output to the screen. This function outputs the value of the argument(s) passed to it. For example:
Code :
print("Hello, World!")
This will print the string Hello, World! to the console.
5. How do you take input from the user in Python?
Answer: In Python, you can take input from the user using the input() function. This function waits for the user to type something on the keyboard and returns it as a string. For example:
Code :
name = input("Enter your name: ")
print("Hello ", name)
This code will prompt the user to enter their name, and then print a greeting with their name. If you need to convert the input into a different type, such as an integer or float, you can use the int() or float() functions.
6. What does the int() function do in Python?
Answer: The int() function in Python is used to convert a value into an integer. If the value is a string representing a whole number, int() will return its integer equivalent. For example:
Code :
number = int("42")
print(number)
This will print 42 as an integer. If you try to convert a string that is not a valid number, Python will raise a ValueError.
7. What is a string in Python and how do you create one?
Answer: A string in Python is a sequence of characters enclosed in either single quotes (') or double quotes ("). Strings are used to represent text data. For example:
Code :
greeting = "Hello, World!"
name = 'Python'
You can create multi-line strings using triple quotes (''' or '''):
Code :
message = '''This is a
multi-line string.'''
Note : Strings are immutable, meaning their content cannot be changed after they are created.
8. How can you join two strings in Python?
Answer: In Python, you can join two strings together using the + operator, which concatenates them. For example:
Code :
first_name = "JD"
last_name = "Sir"
full_name = first_name + " " + last_name
print(full_name)
This will print JD Sir.
9. What is the difference between = and = = in Python?
Answer: In Python, = is the assignment operator. It is used to assign a value to a variable. For example:
Code :
x = 5 # Assigns the value 5 to x
On the other hand, = = is the equality operator, used to compare if two values are equal. For example:
Code :
x = 5
y = 5
print(x == y) # Returns True because x and y are equal
10. What are the basic rules for naming variables in Python?
Answer: In Python, variable names must follow these basic rules:
- Variable names can only contain letters (a-z, A-Z), digits (0-9), and the underscore (_).
- The first character of a variable name cannot be a digit (it must be a letter or underscore).
- Variable names are case-sensitive, Variable and VARIABLE are considered different meanings.
- Variable names cannot be keywords (reserved words like if, else, for, etc.).