Revert "bpo-32604: PEP 554 for use in test suite (GH-19985)" (#20465)

This reverts commit 9d17cbf33d.

Lib/test/support/interpreters.py

@@ -1,183 +0,0 @@
-"""Subinterpreters High Level Module."""
-
-import _xxsubinterpreters as _interpreters
-
-# aliases:
-from _xxsubinterpreters import (
-    ChannelError, ChannelNotFoundError, ChannelEmptyError,
-    is_shareable,
-)
-
-
-__all__ = [
-    'Interpreter', 'get_current', 'get_main', 'create', 'list_all',
-    'SendChannel', 'RecvChannel',
-    'create_channel', 'list_all_channels', 'is_shareable',
-    'ChannelError', 'ChannelNotFoundError',
-    'ChannelEmptyError',
-    ]
-
-
-def create(*, isolated=True):
-    """
-    Initialize a new (idle) Python interpreter.
-    """
-    id = _interpreters.create(isolated=isolated)
-    return Interpreter(id, isolated=isolated)
-
-
-def list_all():
-    """
-    Get all existing interpreters.
-    """
-    return [Interpreter(id) for id in
-            _interpreters.list_all()]
-
-
-def get_current():
-    """
-    Get the currently running interpreter.
-    """
-    id = _interpreters.get_current()
-    return Interpreter(id)
-
-
-def get_main():
-    """
-    Get the main interpreter.
-    """
-    id = _interpreters.get_main()
-    return Interpreter(id)
-
-
-class Interpreter:
-    """
-    The Interpreter object represents
-    a single interpreter.
-    """
-
-    def __init__(self, id, *, isolated=None):
-        self._id = id
-        self._isolated = isolated
-
-    @property
-    def id(self):
-        return self._id
-
-    @property
-    def isolated(self):
-        if self._isolated is None:
-            self._isolated = _interpreters.is_isolated(self._id)
-        return self._isolated
-
-    def is_running(self):
-        """
-        Return whether or not the identified
-        interpreter is running.
-        """
-        return _interpreters.is_running(self._id)
-
-    def close(self):
-        """
-        Finalize and destroy the interpreter.
-
-        Attempting to destroy the current
-        interpreter results in a RuntimeError.
-        """
-        return _interpreters.destroy(self._id)
-
-    def run(self, src_str, /, *, channels=None):
-        """
-        Run the given source code in the interpreter.
-        This blocks the current Python thread until done.
-        """
-        _interpreters.run_string(self._id, src_str)
-
-
-def create_channel():
-    """
-    Create a new channel for passing data between
-    interpreters.
-    """
-
-    cid = _interpreters.channel_create()
-    return (RecvChannel(cid), SendChannel(cid))
-
-
-def list_all_channels():
-    """
-    Get all open channels.
-    """
-    return [(RecvChannel(cid), SendChannel(cid))
-            for cid in _interpreters.channel_list_all()]
-
-
-_NOT_SET = object()
-
-
-class RecvChannel:
-    """
-    The RecvChannel object represents
-    a recieving channel.
-    """
-
-    def __init__(self, id):
-        self._id = id
-
-    def recv(self, *, _delay=10 / 1000):  # 10 milliseconds
-        """
-        Get the next object from the channel,
-        and wait if none have been sent.
-        Associate the interpreter with the channel.
-        """
-        import time
-        sentinel = object()
-        obj = _interpreters.channel_recv(self._id, sentinel)
-        while obj is sentinel:
-            time.sleep(_delay)
-            obj = _interpreters.channel_recv(self._id, sentinel)
-        return obj
-
-    def recv_nowait(self, default=_NOT_SET):
-        """
-        Like recv(), but return the default
-        instead of waiting.
-
-        This function is blocked by a missing low-level
-        implementation of channel_recv_wait().
-        """
-        if default is _NOT_SET:
-            return _interpreters.channel_recv(self._id)
-        else:
-            return _interpreters.channel_recv(self._id, default)
-
-
-class SendChannel:
-    """
-    The SendChannel object represents
-    a sending channel.
-    """
-
-    def __init__(self, id):
-        self._id = id
-
-    def send(self, obj):
-        """
-        Send the object (i.e. its data) to the receiving
-        end of the channel and wait. Associate the interpreter
-        with the channel.
-        """
-        import time
-        _interpreters.channel_send(self._id, obj)
-        time.sleep(2)
-
-    def send_nowait(self, obj):
-        """
-        Like send(), but return False if not received.
-
-        This function is blocked by a missing low-level
-        implementation of channel_send_wait().
-        """
-
-        _interpreters.channel_send(self._id, obj)
-        return False