Python Basics Practise Sheet

Python Practice Sheet Please follow the codes and think how they are executed line by line in order to understand them. Part I: Theory Questions (2 Marks Each) 1. break vs. continue • break: Exits the entire loop immediately. • continue: Skips the current iteration and moves to the next one. Example: for i in range(5): if i == 3: break # Loop ends here when i == 3 print(i) for i in range(5): if i == 3: continue # Skips printing 3 print(i) 2. Type Casting Converting a variable from one type to another. • str → int: int("123") → 123 • int → float: float(5) → 5.0 • float → str: str(3.14) → "3.14" 3. == vs. is • ==: Compares values (are contents equal?). • is: Compares identities (are they the same object?). Use case: a = [1, 2]

b = [1, 2] print(a == b) # True (values equal) print(a is b) # False (different objects) 4. for vs. while Loop • for: Used when the number of iterations is known. • while: Used when looping until a condition becomes false. Example scenario for while: Keep asking the user for input until they enter "exit". 5. Nested Loops A loop inside another loop. Example use case (in words): Printing a multiplication table (rows and columns), or processing 2D data like a grid or matrix. Part II: Coding Problems (5 Marks Each) 1. Even or Odd n = int(input("Enter an integer: ")) if n % 2 == 0: print("Even") else: print("Odd") 2. Sum of First N Naturals N = int(input("Enter N: ")) total = 0 i = 1 while i <= N: total += i i += 1 print("Sum =", total) 3. Factorial n = int(input("Enter n: ")) fact = 1 for i in range(1, n + 1): fact *= i print(f"{n}! =", fact) 4. Multiplication Table x = int(input("Enter a number: ")) for i in range(1, 11):

print(f"{x} × {i} = {x * i}") 5. Prime Check p = int(input("Enter a number: ")) if p <= 1: print("Not Prime") else: for i in range(2, int(p**0.5) + 1): if p % i == 0: print("Not Prime") break else: print("Prime") 6. Sum of Digits m = int(input("Enter a number: ")) s = 0 while m > 0: s += m % 10 m = m // 10 print("Sum of digits =", s) 7. Reverse a String s = input("Enter a string: ") reversed_s = s[::-1] print("Reversed:", reversed_s) 8. Max and Min in a List nums = list(map(int, input("Enter numbers: ").split())) max_val = nums[0] min_val = nums[0] for num in nums: if num > max_val: max_val = num if num < min_val: min_val = num print("Max:", max_val) print("Min:", min_val) 9. Right-Angled Triangle Pattern h = int(input("Enter height: ")) for i in range(1, h + 1): print("* " * i) 10. Floyd’s Triangle r = int(input("Enter rows: ")) num = 1 for i in range(1, r + 1): for j in range(i): print(num, end=" ") num += 1 print() 11. Numeric Pyramid n = int(input("Enter height: ")) for i in range(1, n + 1):