Error Handling — Try, Except, Finally

try:
    result = 10 / 0
except ZeroDivisionError:
    print("Cannot divide by zero")
except ValueError as e:
    print(f"Value error: {e}")
except Exception as e:
    print(f"Unexpected error: {e}")
else:
    print("No error occurred")
finally:
    print("This always runs")

Common exceptions:

ValueError — wrong value type

TypeError — wrong data type

KeyError — dict key not found

IndexError — list index out of range

FileNotFoundError — file doesn't exist

AttributeError — object has no attribute

Raising exceptions:

def divide(a, b):
    if b == 0:
        raise ValueError("Denominator cannot be zero")
    return a / b

Custom exceptions:

class InsufficientFundsError(Exception):
    pass

Reference:

Wikipedia: Exception Handling

https://en.wikipedia.org/wiki/Exception_handling