select API Reference

Python Library Documentation: class OSError in module builtins

class OSError(Exception)
 |  Base class for I/O related errors.
 |
 |  Method resolution order:
 |      OSError
 |      Exception
 |      BaseException
 |      object
 |
 |  Built-in subclasses:
 |      BlockingIOError
 |      ChildProcessError
 |      ConnectionError
 |      FileExistsError
 |      ... and 7 other subclasses
 |
 |  Methods defined here:
 |
 |  __init__(self, /, *args, **kwargs)
 |      Initialize self.  See help(type(self)) for accurate signature.
 |
 |  __reduce__(...)
 |      Helper for pickle.
 |
 |  __str__(self, /)
 |      Return str(self).
 |
 |  ----------------------------------------------------------------------
 |  Static methods defined here:
 |
 |  __new__(*args, **kwargs)
 |      Create and return a new object.  See help(type) for accurate signature.
 |
 |  ----------------------------------------------------------------------
 |  Data descriptors defined here:
 |
 |  characters_written
 |
 |  errno
 |      POSIX exception code
 |
 |  filename
 |      exception filename
 |
 |  filename2
 |      second exception filename
 |
 |  strerror
 |      exception strerror
 |
 |  winerror
 |      Win32 exception code
 |
 |  ----------------------------------------------------------------------
 |  Methods inherited from BaseException:
 |
 |  __getattribute__(self, name, /)
 |      Return getattr(self, name).
 |
 |  __repr__(self, /)
 |      Return repr(self).
 |
 |  __setstate__(...)
 |
 |  add_note(...)
 |      Exception.add_note(note) --
 |      add a note to the exception
 |
 |  with_traceback(...)
 |      Exception.with_traceback(tb) --
 |      set self.__traceback__ to tb and return self.
 |
 |  ----------------------------------------------------------------------
 |  Data descriptors inherited from BaseException:
 |
 |  __cause__
 |      exception cause
 |
 |  __context__
 |      exception context
 |
 |  __dict__
 |
 |  __suppress_context__
 |
 |  __traceback__
 |
 |  args

Python Library Documentation: built-in function select in module select

select(rlist, wlist, xlist, timeout=None, /)
    Wait until one or more file descriptors are ready for some kind of I/O.

    The first three arguments are iterables of file descriptors to be waited for:
    rlist -- wait until ready for reading
    wlist -- wait until ready for writing
    xlist -- wait for an "exceptional condition"
    If only one kind of condition is required, pass [] for the other lists.

    A file descriptor is either a socket or file object, or a small integer
    gotten from a fileno() method call on one of those.

    The optional 4th argument specifies a timeout in seconds; it may be
    a floating-point number to specify fractions of seconds.  If it is absent
    or None, the call will never time out.

    The return value is a tuple of three lists corresponding to the first three
    arguments; each contains the subset of the corresponding file descriptors
    that are ready.

    *** IMPORTANT NOTICE ***
    On Windows, only sockets are supported; on Unix, all file
    descriptors can be used.