Day 19: Error Handling (try/except)

Write a program that asks for two numbers to divide, but use try/except to handle non-numbers and division by zero. (Concepts: try/except, exceptions, input validation)

try:
    num1 = float(input("Enter first number: "))
    num2 = float(input("Enter second number: "))
    result = num1 / num2
    print("Result:", result)
except ValueError:
    print("Please enter valid numbers!")
except ZeroDivisionError:
    print("Cannot divide by zero!")

Day 19: Make code robust with error handling! try: block runs risky code: Inputs to floats (crashes on non-numbers), divide, print. If error, jumps to except. except ValueError: catches input conversion fails (e.g., "abc"). except ZeroDivisionError: for /0.

Run: Valid 10/2=5.0; "abc" → ValueError message; 5/0 → ZeroDivision. Graceful—no crash! In 10-15 min, add a general except Exception: for others. Try/except prevents bugs; always validate inputs. Ties to Day 2 math safely!

Key Concepts:

  • try/except: try: tests code; except ExceptionType: catches and handles specific errors without crashing.
  • Exceptions: Built-in errors like ValueError (bad conversion) or ZeroDivisionError (math issue).
  • Input Validation: Checking user input before use to avoid errors (e.g., converting safely).

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