Robust Error Handling

Proper error handling prevents crashes and improves user experience. Learn to anticipate and manage exceptions gracefully.

Exception Handling Basics

try:
    risk_operation()
except:
    handle_error()
Structure:
  • try block contains risky code
  • except handles specific exceptions
  • Optional else and finally blocks

Targeted Error Handling

try:
    file = open("missing.txt")
except FileNotFoundError:
    print("File not found!")
β†’
File not found!

Always catch specific exceptions to avoid masking unexpected errors.

Common Pitfalls

# Bare except clause
try: ...
except: ...  # Catches ALL exceptions
# Overly broad except
except Exception: ...

Practical Use: Database Connection

def connect_db():
    try:
        # Connection logic
    except ConnectionError:
        print("πŸ”Œ Connection failed")
    except TimeoutError:
        print("βŒ› Timeout occurred")
    else:
        print("βœ… Connected successfully")

Your Task: Safe Input Conversion

Convert user input to integer safely:

  1. Use try/except around conversion
  2. Catch ValueError specifically
  3. Inform user of invalid input
  4. Default to 0 on error

Test cases: "42" β†’ 42, "abc" β†’ 0 with warning

Section 1/5Exception Handling Basics

Exception Handling Basics

Explore this concept

Robust Error Handling

Proper error handling prevents crashes and improves user experience. Learn to anticipate and manage exceptions gracefully.

Exception Handling Basics

try:
    risk_operation()
except:
    handle_error()
Structure:
  • try block contains risky code
  • except handles specific exceptions
  • Optional else and finally blocks

Output:

Click "Check" to run your code.