notes-shivam

python programs

5 min read

1. Patterns

Square of Stars

n = 5
for i in range(n):
    for j in range(n):
        print("*", end=" ")
    print()

Output:

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

Right-Angle Triangle

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

Output:

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

Inverted Triangle

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

Output:

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

Star Pyramid

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

Output:

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

Inverted Star Pyramid

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

Output:

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

Number Pyramid

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

Output:

        1 
      1 2 
    1 2 3 
  1 2 3 4 
1 2 3 4 5

Diamond Pattern

n = 5
# Upper half
for i in range(1, n+1):
    for j in range(n-i):
        print(" ", end=" ")
    for j in range(2*i-1):
        print("*", end=" ")
    print()
# Lower half
for i in range(n-1, 0, -1):
    for j in range(n-i):
        print(" ", end=" ")
    for j in range(2*i-1):
        print("*", end=" ")
    print()

Output:

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

2. Matrix Programs

Input and Print Matrix

rows = 2
cols = 3
 
matrix = []
for i in range(rows):
    row = []
    for j in range(cols):
        val = int(input(f"Enter element at ({i},{j}): "))
        row.append(val)
    matrix.append(row)
 
print("Matrix is:")
for i in range(rows):
    for j in range(cols):
        print(matrix[i][j], end=" ")
    print()

Input Example:

1 2 3
4 5 6

Output:

Matrix is:
1 2 3 
4 5 6

Matrix Addition

A = [[1, 2], [3, 4]]
B = [[5, 6], [7, 8]]
 
rows, cols = len(A), len(A[0])
result = []
 
for i in range(rows):
    row = []
    for j in range(cols):
        row.append(A[i][j] + B[i][j])
    result.append(row)
 
print("Addition:")
for row in result:
    print(row)

Output:

Addition:
[6, 8]
[10, 12]

Matrix Multiplication

A = [[1, 2], [3, 4]]
B = [[5, 6], [7, 8]]
 
rows, cols = len(A), len(B[0])
result = [[0]*cols for _ in range(rows)]
 
for i in range(len(A)):
    for j in range(len(B[0])):
        for k in range(len(B)):
            result[i][j] += A[i][k] * B[k][j]
 
print("Multiplication:")
for row in result:
    print(row)

Output:

Multiplication:
[19, 22]
[43, 50]

Transpose of Matrix

A = [[1, 2, 3], [4, 5, 6]]
rows, cols = len(A), len(A[0])
 
transpose = []
for i in range(cols):
    row = []
    for j in range(rows):
        row.append(A[j][i])
    transpose.append(row)
 
print("Transpose:")
for row in transpose:
    print(row)

Output:

Transpose:
[1, 4]
[2, 5]
[3, 6]

3. Basic Number Problems

Fibonacci Series

n = 10
a, b = 0, 1
for i in range(n):
    print(a, end=" ")
    a, b = b, a+b

Output:

0 1 1 2 3 5 8 13 21 34

Factorial

n = 5
fact = 1
for i in range(1, n+1):
    fact *= i
print("Factorial:", fact)

Output:

Factorial: 120

Prime Number Check

n = 29
is_prime = True
 
if n < 2:
    is_prime = False
else:
    for i in range(2, n):
        if n % i == 0:
            is_prime = False
            break
 
if is_prime:
    print("Prime")
else:
    print("Not Prime")

Output:

Prime

Palindrome Number

n = 121
temp = n
rev = 0
 
while n > 0:
    d = n % 10
    rev = rev*10 + d
    n //= 10
 
if temp == rev:
    print("Palindrome")
else:
    print("Not Palindrome")

Output:

Palindrome

Armstrong Number

n = 153
temp = n
sum = 0
digits = len(str(n))
 
while n > 0:
    d = n % 10
    sum += d**digits
    n //= 10
 
if sum == temp:
    print("Armstrong")
else:
    print("Not Armstrong")

Output:

Armstrong

4. String Problems

Reverse a String

s = "Python"
rev = ""
for ch in s:
    rev = ch + rev
print("Reversed:", rev)

Output:

Reversed: nohtyP

Count Vowels

s = "programming"
vowels = "aeiou"
count = 0
 
for ch in s:
    if ch in vowels:
        count += 1
 
print("Vowel count:", count)

Output:

Vowel count: 3

Palindrome String

s = "madam"
rev = ""
for ch in s:
    rev = ch + rev
 
if s == rev:
    print("Palindrome String")
else:
    print("Not Palindrome")

Output:

Palindrome String

Anagram Check

s1 = "listen"
s2 = "silent"
 
if sorted(s1) == sorted(s2):
    print("Anagram")
else:
    print("Not Anagram")

Output:

Anagram

Character Frequency

s = "banana"
freq = {}
 
for ch in s:
    if ch in freq:
        freq[ch] += 1
    else:
        freq[ch] = 1
 
print("Character frequency:", freq)

Output:

Character frequency: {'b': 1, 'a': 3, 'n': 2}

⚡ Now you have a complete set of 25+ Python practice programs with outputs, covering patterns, pyramids, matrices, number problems, and string problems.

Do you want me to also prepare a mini-question bank (50–60 problems with hints, no solutions) so you can try them yourself before checking answers?

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