AKTU Python Programming Question Paper 2025

B.Tech III Semester – BCC302 – Python Programming

This page provides the AKTU B.Tech Python Programming Question Paper 2024–25 for BCC302 along with complete exam-oriented solutions.

Question Paper – Section Wise

Section A – Short Answer Questions

Q1. Attempt all questions in brief.

Q1(a)

Question: State how to handle exceptions in Python? Provide a simple example.

Q1(b)

Question: What will be the output of the following Python program?

def compute(x):
    return [i**2 for i in x if i%2==0]

print(compute([1, 2, 3, 4, 5]))

Q1(c)

Question: Explain floor division with an example.

Q1(d)

Question: Describe the purpose of the with statement in file handling.

Q1(e)

Question: Briefly describe the use of lambda functions in Python.

Q1(f)

Question: Demonstrate how to assign a single value to a tuple.

Q1(g)

Question: Explain why NumPy is used instead of Python arrays for mathematical calculations.

Section A – Answers

Q1(a) Answer

Exceptions in Python are handled using the try, except, else and finally blocks. The try block contains the code that may generate an exception, while the except block handles the exception.

try:
    a = 10
    b = 0
    print(a / b)

except ZeroDivisionError:
    print("Cannot divide by zero")

Output:

Q1(b) Answer

The list comprehension selects only even numbers from the list and calculates their squares.

Q1(c) Answer

Floor division is performed using the // operator. It returns the quotient after rounding down to the nearest integer.

print(10 // 3)

Output: 3

Q1(d) Answer

The with statement is used to handle files safely. It automatically closes the file after the operation is completed, even if an exception occurs.

with open("data.txt", "r") as file:
    data = file.read()
    print(data)

Q1(e) Answer

A lambda function is a small anonymous function defined using the lambda keyword. It can take any number of arguments but contains only one expression.

square = lambda x: x * x

print(square(5))

Output: 25

Q1(f) Answer

A single-value tuple is created by placing a comma after the value. The comma is necessary to identify it as a tuple.

t = (10,)
print(t)

Output: (10,)

Q1(g) Answer

NumPy is preferred for mathematical calculations because it provides efficient numerical arrays and supports fast mathematical operations. It also provides many functions for scientific and numerical computing.

NumPy arrays generally require less memory and perform numerical operations faster than ordinary Python lists.

Section B – Answers

Q2. Attempt any three of the following.

07 × 3 = 21

Q2(a) Answer

Question: Design a basic calculator in Python that supports addition, subtraction, multiplication and division.

A calculator can be implemented using arithmetic operators and conditional statements.

a = float(input("Enter first number: "))
b = float(input("Enter second number: "))

print("1. Addition")
print("2. Subtraction")
print("3. Multiplication")
print("4. Division")

choice = int(input("Enter your choice: "))

if choice == 1:
    print("Result =", a + b)

elif choice == 2:
    print("Result =", a - b)

elif choice == 3:
    print("Result =", a * b)

elif choice == 4:
    if b != 0:
        print("Result =", a / b)
    else:
        print("Division by zero is not possible")

else:
    print("Invalid choice")

Q2(b) Answer

Question: Define Membership and Identity Operators. Given: a = 3, b = 3, distinguish between (a is b) and (a == b).

Membership operators are used to check whether a value is present in a sequence. The membership operators are in and not in.

Identity operators are used to check whether two variables refer to the same object. The identity operators are is and is not.

a = 3
b = 3

print(a == b)
print(a is b)

Difference:

For the given small integer values, Python commonly reuses integer objects, so both expressions may produce True. However, == checks value equality, whereas is checks object identity.

Q2(c) Answer

Question: Write a Python function to count the frequency of each character in a given string and return the output in a dictionary.

Example: char_frequency("HELLO") returns {"H":1, "E":1, "L":2, "O":1}.

def char_frequency(text):
    frequency = {}

    for ch in text:
        if ch in frequency:
            frequency[ch] += 1
        else:
            frequency[ch] = 1

    return frequency


result = char_frequency("HELLO")
print(result)

Output:

Q2(d) Answer

Question: Write a program to reverse the contents of a file character by character, separating each character with a comma.

with open("data.txt", "r") as file:
    content = file.read()

reversed_content = content[::-1]

result = ",".join(reversed_content)

with open("output.txt", "w") as file:
    file.write(result)

print(result)

The program reads the complete contents of the file, reverses the characters using slicing and separates every character using a comma. The final result is stored in output.txt.

Q2(e) Answer

Question: Create a pie chart using Matplotlib to represent the following data:

import matplotlib.pyplot as plt

languages = ["Python", "Java", "C++", "JavaScript", "Ruby"]
values = [30, 25, 20, 15, 10]

plt.pie(values, labels=languages, autopct="%1.1f%%")
plt.title("Programming Languages")
plt.show()

The pie() function is used to create the pie chart. The labels parameter displays the language names and autopct displays the percentage values.

Section C – Answers

Q3(a) Answer

Question: Write short notes on Operator Precedence, Python Indentation and Type Conversion.

1. Operator Precedence:
Operator precedence determines the order in which operators are evaluated in an expression. Operators with higher precedence are evaluated before operators with lower precedence.

result = 10 + 5 * 2
print(result)

Output: 20

Multiplication is performed before addition. Parentheses can be used to change the order of evaluation.

2. Python Indentation:
Indentation is used to define blocks of code in Python. Unlike many other programming languages, Python does not use braces { } to define blocks.

if 10 > 5:
    print("10 is greater than 5")

The indented statement belongs to the if block. Incorrect indentation results in an error.

3. Type Conversion:
Type conversion means converting a value from one data type to another. Python provides functions such as int(), float(), str() and bool() for type conversion.

x = "25"

a = int(x)
b = float(x)

print(a)
print(b)

Q3(b) Answer

Question: Write a program to validate email addresses using regular expressions. The email must contain @, must contain a domain name and should not contain spaces.

Regular expressions are used to search and validate patterns in text. Python provides the re module for working with regular expressions.

import re

email = input("Enter email address: ")

pattern = r"^[^@\s]+@[^@\s]+\.[^@\s]+$"

if re.match(pattern, email):
    print("Valid email address")
else:
    print("Invalid email address")

The regular expression checks that the email contains an @, has a domain part and does not contain spaces.

Q4(a) Answer

Question: Write a program to create a hollow pyramid pattern.

n = 5

for i in range(1, n + 1):

    for j in range(n - i):
        print(" ", end="")

    for j in range(1, 2 * i):
        if i == n or j == 1 or j == 2 * i - 1:
            print("*", end="")
        else:
            print(" ", end="")

    print()

The program uses nested for loops. Spaces are printed to position the pyramid, while stars are printed only at the boundary of the pyramid to make it hollow.

Q4(b) Answer

Question: Explain why loops are needed and the types of loops in Python.

Loops are used to execute a block of statements repeatedly until a specified condition is satisfied or the elements of a sequence have been processed.

Python mainly provides the following types of loops:

1. for loop:
A for loop is used to iterate over a sequence such as a list, tuple, string or range.

for i in range(1, 6):
    print(i)

2. while loop:
A while loop repeatedly executes statements as long as the given condition is true.

i = 1

while i <= 5:
    print(i)
    i += 1

Q5(a) Answer

Question: Write a function to find the longest word in a given list of words.

def longest_word(words):

    longest = words[0]

    for word in words:
        if len(word) > len(longest):
            longest = word

    return longest


words = ["apple", "banana", "cherry"]

print(longest_word(words))

Output:

Q5(b) Answer

Question: Distinguish between Tuple and List with examples. Explain with examples at least four built-in methods of Dictionary.

Difference between List and Tuple:

my_list = [10, 20, 30]
my_list[0] = 50

my_tuple = (10, 20, 30)

print(my_list)
print(my_tuple)

Four Dictionary Built-in Methods:

1. keys(): Returns all keys of the dictionary.

student = {"name": "Amit", "age": 20}

print(student.keys())

2. values(): Returns all values of the dictionary.

print(student.values())

3. items(): Returns key-value pairs.

print(student.items())

4. get(): Returns the value associated with a specified key.

print(student.get("name"))

Q6(a) Answer

Question: Discuss different types of file modes in Python and explain with examples.

File modes specify how a file is opened for an operation. The commonly used file modes are:

file = open("data.txt", "r")

data = file.read()

file.close()

print(data)

Q6(b) Answer

Question: Write a program to read a CSV file and display rows where a specific column value exceeds a given threshold.

import csv

threshold = 50

with open("data.csv", "r") as file:

    reader = csv.DictReader(file)

    for row in reader:

        if float(row["marks"]) > threshold:
            print(row)

The program reads the CSV file using DictReader and checks the value of the specified marks column. Only rows having marks greater than the threshold are displayed.

Q7(a) Answer

Question: Discuss the role of event handling in Tkinter. How can you bind events? Provide examples.

Event handling in Tkinter is used to perform an action when the user interacts with a graphical user interface. Events may include mouse clicks, key presses and mouse movements.

The bind() method is used to associate an event with a function.

import tkinter as tk

def click_event(event):
    print("Mouse clicked")

root = tk.Tk()

root.title("Event Handling")

root.bind("<Button-1>", click_event)

root.mainloop()

Here, <Button-1> represents a left mouse-button click. When the event occurs, the click_event() function is executed.

Q7(b) Answer

Question: Write a program to read data from CSV students.csv, calculate average marks for each student and display the results.

import csv

students = {}

with open("students.csv", "r") as file:

    reader = csv.DictReader(file)

    for row in reader:

        name = row["name"]
        marks = float(row["marks"])

        if name not in students:
            students[name] = []

        students[name].append(marks)


for name, marks in students.items():

    average = sum(marks) / len(marks)

    print(name, "Average Marks =", average)

The program reads the student records from the CSV file, stores the marks of each student and calculates the average using:

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