Python 2.x 3.x compatibility notes

Exceptions

Exception hierachy

Python <= 3.2

• BaseException
  • Exception
    • StandardError
      • EnvironmentError
        • IOError
          • socket.error
        • OSError
    • select.error

Python >= 3.3

• BaseException
  • Exception
    • OSError
      • BlockingIOError
      • EnvironmentError
      • IOError
      • select.error
      • socket.error

Refs

• https://docs.python.org/2/library/exceptions.html#exception-hierarchy
• https://docs.python.org/3/library/exceptions.html#exception-hierarchy
• https://docs.python.org/3/whatsnew/3.3.html#pep-3151

InterruptedError

Python 3.5+ automatically retries system calls that return EINTR.

• https://docs.python.org/3/library/exceptions.html#InterruptedError
• https://docs.python.org/3/whatsnew/3.5.html#pep-475-retry-system-calls-failing-with-eintr

Backports

• https://github.com/PythonBackports?tab=repositories