Python · Theory

Built-in exceptions

Theory

66/268

Built-in exceptions

Python ships named errors for common failures. ValueError: int("Asha"). TypeError: 1 + "a". IndexError: list[99]. KeyError: dict missing key. FileNotFoundError: open missing path. ZeroDivisionError: 10/0. Exception is a common parent. Catch the type you expect, not a bare except.

Name five and one cause each. That is the viva. Matching name → cause scores more than reciting the hierarchy.

Built-in exceptions — output — ValueError. int("Asha") is the classic cause.

Diagram

try:  10 / 0
         │ ZeroDivisionError
         ▼
  except → Cannot divide
         │
         ▼
      finally

Exam tip

Five names + one cause each.

Example

# Built-in exceptions
try:
    int("Asha")
except ValueError as e:
    print(type(e).__name__)

Built-in exceptions — output: ValueError. int("Asha") is the classic cause.

Short notes

DefValueError / TypeError
RuleIndexError / KeyError
RememberFileNotFound / ZeroDivision

Python · Theory

Built-in exceptions

← All stacks

Theory

66/268

Built-in exceptions

Name five and one cause each. That is the viva. Matching name → cause scores more than reciting the hierarchy.

Built-in exceptions — output — ValueError. int("Asha") is the classic cause.

Diagram

try:  10 / 0
         │ ZeroDivisionError
         ▼
  except → Cannot divide
         │
         ▼
      finally

Exam tip

Five names + one cause each.

Example

# Built-in exceptions
try:
    int("Asha")
except ValueError as e:
    print(type(e).__name__)

Built-in exceptions — output: ValueError. int("Asha") is the classic cause.

Short notes

DefValueError / TypeError
RuleIndexError / KeyError
RememberFileNotFound / ZeroDivision

Built-in exceptions

Example

Short notes

Questions

Built-in exceptions

Example

Short notes

Questions