intermediateError Handling

Exception Handling

Handle errors gracefully with try/except/finally.

In this lesson

01Try / Except

Catch and handle exceptions to prevent crashes.

Python
1try:
2    result = 10 / 0
3except ZeroDivisionError:
4    print("Cannot divide by zero!")
5except Exception as e:
6    print(f"Unexpected error: {e}")
Output
Cannot divide by zero!

02Try / Except / Else / Finally

Else runs if no exception; finally always runs.

Python
1def safe_divide(a, b):
2    try:
3        result = a / b
4    except ZeroDivisionError:
5        print("Error: division by zero")
6        return None
7    except TypeError:
8        print("Error: invalid types")
9        return None
10    else:
11        print(f"Success: {result}")
12        return result
13    finally:
14        print("Operation complete.\n")
15

16safe_divide(10, 3)
17safe_divide(10, 0)
Output
Success: 3.3333333333333335
Operation complete.

Error: division by zero
Operation complete.

03Raising Exceptions

Use raise to throw exceptions intentionally.

Python
1def set_age(age):
2    if age < 0:
3        raise ValueError("Age cannot be negative")
4    if not isinstance(age, int):
5        raise TypeError("Age must be an integer")
6    return age
7

8try:
9    set_age(-5)
10except ValueError as e:
11    print(f"Caught: {e}")
Output
Caught: Age cannot be negative
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