Suggested Python Practicals for Class XI

1️⃣ Input a welcome message and display it

msg = input("Enter a welcome message: ")
print("Welcome Message:", msg)

2️⃣ Input two numbers and display the larger and smaller number

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

if a > b:
    print("Larger:", a)
    print("Smaller:", b)
else:
    print("Larger:", b)
    print("Smaller:", a)

3️⃣ Input three numbers and display the largest and smallest number

a = int(input("Enter first number: "))
b = int(input("Enter second number: "))
c = int(input("Enter third number: "))

largest = max(a, b, c)
smallest = min(a, b, c)

print("Largest:", largest)
print("Smallest:", smallest)

4️⃣ Pattern Programs (Using Nested Loops)

Pattern–1

*
**
***
****
*****

for i in range(1, 6):
    for j in range(i):
        print("*", end="")
    print()

Pattern–2

for i in range(5, 0, -1):
    for j in range(1, i+1):
        print(j, end="")
    print()

Pattern–3

A
AB
ABC
ABCD
ABCDE

for i in range(1, 6):
    for j in range(i):
        print(chr(65 + j), end="")
    print()

5️⃣ Sum of Series

(a) `1 + x + x² + x³ + ... + xⁿ`

x = int(input("Enter x: "))
n = int(input("Enter n: "))
s = 0

for i in range(n+1):
    s = s + x**i

print("Sum =", s)

(b) `1 − x + x² − x³ + ... ± xⁿ`

x = int(input("Enter x: "))
n = int(input("Enter n: "))
s = 0

for i in range(n+1):
    if i % 2 == 0:
        s += x**i
    else:
        s -= x**i

print("Sum =", s)

(c) `x + x²/2 + x³/3 + ... + xⁿ/n`

x = int(input("Enter x: "))
n = int(input("Enter n: "))
s = 0

for i in range(1, n+1):
    s = s + (x**i)/i

print("Sum =", s)

(d) `x + x²/2! + x³/3! + ... + xⁿ/n!`

x = int(input("Enter x: "))
n = int(input("Enter n: "))

fact = 1
s = 0

for i in range(1, n+1):
    fact = fact * i
    s = s + (x**i)/fact

print("Sum =", s)

6️⃣ Check Perfect / Armstrong / Palindrome Number

Hint

Perfect Number: A positive integer that is equal to the sum of its proper positive divisors (excluding the number itself). The first few perfect numbers are 6, 28, 496, and 8128.

Example: The proper divisors of 6 are 1, 2, and 3. Their sum is $1 plus 2 plus 3 equals 6$ 1+2+3=6.

Armstrong Number: Also known as a narcissistic number, it is a number that is equal to the sum of its own digits, each raised to the power of the total number of digits in the number.

Example: 153 is a 3-digit Armstrong number because $1 cubed plus 5 cubed plus 3 cubed equals 1 plus 125 plus 27 equals 153$ 13+53+33=1+125+27=153.
Example: 1634 is a 4-digit Armstrong number because $1 to the fourth power plus 6 to the fourth power plus 3 to the fourth power plus 4 to the fourth power equals 1 plus 1296 plus 81 plus 256 equals 1634$ 14+64+34+44=1+1296+81+256=1634.

Palindrome Number: A number (or a string) that reads the same backward as forward.

Example: 78987 is a palindrome number because it reads the same in either direction.

Example: 121 is a palindrome number because its reverse is also 121.

n = int(input("Enter number: "))

# Palindrome
if str(n) == str(n)[::-1]:
    print("Palindrome Number")

# Armstrong
temp = n
s = 0
digits = len(str(n))
while temp > 0:
    d = temp % 10
    s += d ** digits
    temp //= 10

if s == n:
    print("Armstrong Number")

# Perfect
sum_div = 0
for i in range(1, n):
    if n % i == 0:
        sum_div += i

if sum_div == n:
    print("Perfect Number")

7️⃣ Prime or Composite Number

n = int(input("Enter number: "))
count = 0

for i in range(1, n+1):
    if n % i == 0:
        count += 1

if count == 2:
    print("Prime Number")
else:
    print("Composite Number")

8️⃣ Fibonacci Series

n = int(input("Enter number of terms: "))

a, b = 0, 1
print(a, b, end=" ")

for i in range(n-2):
    c = a + b
    print(c, end=" ")
    a, b = b, c

9️⃣ GCD and LCM of Two Numbers

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

x, y = a, b
while y != 0:
    x, y = y, x % y

gcd = x
lcm = (a * b) // gcd

print("GCD =", gcd)
print("LCM =", lcm)

🔟 Count vowels, consonants, uppercase, lowercase

s = input("Enter string: ")

vowels = consonants = upper = lower = 0

for ch in s:
    if ch.isupper():
        upper += 1
    if ch.islower():
        lower += 1
    if ch.lower() in "aeiou":
        vowels += 1
    elif ch.isalpha():
        consonants += 1

print("Vowels:", vowels)
print("Consonants:", consonants)
print("Uppercase:", upper)
print("Lowercase:", lower)

1️⃣1️⃣ Palindrome String & Change Case

s = input("Enter string: ")

if s == s[::-1]:
    print("Palindrome String")
else:
    print("Not a Palindrome")

print("Uppercase:", s.upper())
print("Lowercase:", s.lower())

1️⃣2️⃣ Largest and Smallest in List/Tuple

lst = [10, 5, 25, 3, 18]
print("Largest:", max(lst))
print("Smallest:", min(lst))

1️⃣3️⃣ Swap Even and Odd Index Elements

lst = [1, 2, 3, 4, 5, 6]

for i in range(0, len(lst)-1, 2):
    lst[i], lst[i+1] = lst[i+1], lst[i]

print("After Swapping:", lst)

1️⃣4️⃣ Search an Element in List/Tuple

lst = [10, 20, 30, 40]
x = int(input("Enter element to search: "))

if x in lst:
    print("Element Found")
else:
    print("Element Not Found")

1️⃣5️⃣ Dictionary: Students with Marks Above 75

students = {}

n = int(input("Enter number of students: "))

for i in range(n):
    roll = int(input("Enter roll number: "))
    name = input("Enter name: ")
    marks = int(input("Enter marks: "))
    students[roll] = [name, marks]

print("Students scoring above 75:")
for roll in students:
    if students[roll][1] > 75:
        print(students[roll][0])

Just tell me 👍