Python Practice Set: Fundamentals & Operators

This practice set covers Introduction, Variables, Comments, Data Types, Input/Output, and Operators. Use these questions to test your understanding of Python basics.

1. Introduction & Basics

Q1: What is the main difference between a Compiler and an Interpreter? How does Python use these?

Answer: A Compiler translates the entire program into machine code at once, while an Interpreter translates and executes code line-by-line. Python is often called an interpreted language, but it technically compiles code into bytecode first, which is then interpreted by the Python Virtual Machine (PVM).

Q2: Which symbol is used to add comments in Python?

• A) //
• B) /* */
• C) # ?
• D) <!-- -->

2. Variables & Data Types

Q3: Identify the data types of the following variables:

x = 10.5
y = "The Royal Coding"
z = True
w = [1, 2, 3]

| Variable | Value | Data Type | | :--- | :--- | :--- | | x | 10.5 | float | | y | "The Royal Coding" | str (String) | | z | True | bool (Boolean) | | w | [1, 2, 3] | list |

Q4: Can a variable name in Python start with a number?

Answer: No. Variable names must start with a letter (a-z, A-Z) or an underscore (_). They cannot start with a digit.

3. Input & Output (I/O)

Q5: Write a program to take two numbers as input from the user and display their sum.

# Taking input
num1 = input("Enter first number: ")
num2 = input("Enter second number: ")

# Conversion is needed because input() always returns a string
sum_result = float(num1) + float(num2)

# Displaying output
print("The sum of {0} and {1} is {2}".format(num1, num2, sum_result))

4. Operators Practice

Q6: What is the output of the following Modulus operations? | Expression | Expected Result | Why? | | :--- | :--- | :--- | | 10 % 3 | 1 | 10 ÷ 3 leaves a remainder of 1 | | 15 % 5 | 0 | 15 is perfectly divisible by 5 | | 7 % 10 | 7 | 7 cannot be divided by 10, so 7 remains |

Q7: Predict the output of this logical expression:

x = 5
print(x > 3 and x < 10)
print(x > 10 or x < 2)
print(not(x == 5))

Results:

1. True (Both conditions are real)
2. False (Neither condition is real)
3. False (Reverse of True is False)

5. Coding Challenges (Small Tasks)

Task 1: Area of a Circle

Write a Python script that asks for the radius and calculates the area.

import math
radius = float(input("Enter radius: "))
area = math.pi * (radius ** 2)
print(f"The area is: {area:.2f}")

Task 2: Swap Two Variables

Write a program to swap values of two variables a and b without using a third variable.

a = 5
b = 10

# Pythonic way to swap
a, b = b, a

print(f"a is now {a}, b is now {b}")