CBSE Class 12 Computer Science Practical File — Python Programs with Output

The CBSE Class 12 Computer Science (083) practical is 30 marks — and the report file needs a minimum of 15 Python programs and 5 SQL query sets. Here are ready, run-verified Python programs (with their actual output) covering the most common practical topics. Copy, understand, and practise.

stack = []
def push(item):
    stack.append(item)
def pop():
    if not stack:
        return "Stack Empty"
    return stack.pop()
push(10); push(20); push(30)
print("Stack:", stack)
print("Popped:", pop())
print("Stack after pop:", stack)

Stack: [10, 20, 30]
Popped: 30
Stack after pop: [10, 20]

def factorial(n):
    if n == 0 or n == 1:
        return 1
    return n * factorial(n - 1)
num = 5
print("Factorial of", num, "is", factorial(num))

Factorial of 5 is 120

text = "Kwickprep Computer Science"
vowels = consonants = 0
for ch in text.lower():
    if ch.isalpha():
        if ch in "aeiou":
            vowels += 1
        else:
            consonants += 1
print("Vowels:", vowels)
print("Consonants:", consonants)

Vowels: 8
Consonants: 16

def linear_search(arr, key):
    for i in range(len(arr)):
        if arr[i] == key:
            return i
    return -1
data = [12, 45, 7, 23, 56, 89]
pos = linear_search(data, 23)
print("Found at index" , pos) if pos != -1 else print("Not found")

Found at index 3

sentence = "python is easy python is fun"
words = sentence.split()
freq = {}
for w in words:
    freq[w] = freq.get(w, 0) + 1
print(freq)

{'python': 2, 'is': 2, 'easy': 1, 'fun': 1}

n = 8
a, b = 0, 1
print("Fibonacci:", end=" ")
for i in range(n):
    print(a, end=" ")
    a, b = b, a + b

Fibonacci: 0 1 1 2 3 5 8 13

import pickle
students = [{"roll": 1, "name": "Asha", "marks": 92},
            {"roll": 2, "name": "Ravi", "marks": 85}]
with open("students.dat", "wb") as f:
    pickle.dump(students, f)
with open("students.dat", "rb") as f:
    data = pickle.load(f)
for s in data:
    print(s["roll"], s["name"], s["marks"])

1 Asha 92
2 Ravi 85

def reverse(text):
    stack = list(text)
    result = ""
    while stack:
        result += stack.pop()
    return result
print(reverse("KWICKPREP"))

PERPKCIWK

Related: CS 083 weightage · Try code in the Python Playground · Project ideas

Programs verified by execution. Curated by Kajal Ma'am (MCA) — teaching CBSE Computer Science since 2006.