bpo-32604: Recommit "bpo-32604: PEP 554 for use in test suite (GH-19985)" (GH-20611)
* PEP 554 for use in test suite * 📜🤖 Added by blurb_it. * Fix space * Add doc to doc tree * Move to modules doc tree * Fix suspicious doc errors * Fix test__all * Docs docs docs * Support isolated and fix wait * Fix white space * Remove undefined from __all__ * Fix recv and add exceptions * Remove unused exceptions, fix pep 8 formatting errors and fix _NOT_SET in recv_nowait() * Update Lib/test/support/interpreters.py Co-authored-by: Pablo Galindo <Pablogsal@gmail.com> * Remove documentation (module is for internal use) Co-authored-by: nanjekyejoannah <joannah.nanjekye@ibm.com> Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
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Joannah Nanjekye
GitHub
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"""Subinterpreters High Level Module."""
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import _xxsubinterpreters as _interpreters
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# aliases:
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from _xxsubinterpreters import (
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ChannelError, ChannelNotFoundError, ChannelEmptyError,
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is_shareable,
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)
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__all__ = [
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'Interpreter', 'get_current', 'get_main', 'create', 'list_all',
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'SendChannel', 'RecvChannel',
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'create_channel', 'list_all_channels', 'is_shareable',
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'ChannelError', 'ChannelNotFoundError',
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'ChannelEmptyError',
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]
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def create(*, isolated=True):
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"""
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Initialize a new (idle) Python interpreter.
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"""
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id = _interpreters.create(isolated=isolated)
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return Interpreter(id, isolated=isolated)
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def list_all():
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"""
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Get all existing interpreters.
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"""
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return [Interpreter(id) for id in
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_interpreters.list_all()]
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def get_current():
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"""
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Get the currently running interpreter.
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"""
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id = _interpreters.get_current()
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return Interpreter(id)
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def get_main():
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"""
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Get the main interpreter.
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"""
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id = _interpreters.get_main()
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return Interpreter(id)
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class Interpreter:
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"""
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The Interpreter object represents
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a single interpreter.
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"""
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def __init__(self, id, *, isolated=None):
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self._id = id
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self._isolated = isolated
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@property
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def id(self):
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return self._id
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@property
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def isolated(self):
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if self._isolated is None:
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self._isolated = _interpreters.is_isolated(self._id)
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return self._isolated
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def is_running(self):
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"""
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Return whether or not the identified
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interpreter is running.
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"""
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return _interpreters.is_running(self._id)
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def close(self):
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"""
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Finalize and destroy the interpreter.
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Attempting to destroy the current
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interpreter results in a RuntimeError.
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"""
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return _interpreters.destroy(self._id)
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def run(self, src_str, /, *, channels=None):
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"""
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Run the given source code in the interpreter.
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This blocks the current Python thread until done.
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"""
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_interpreters.run_string(self._id, src_str)
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def create_channel():
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"""
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Create a new channel for passing data between
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interpreters.
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"""
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cid = _interpreters.channel_create()
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return (RecvChannel(cid), SendChannel(cid))
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def list_all_channels():
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"""
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Get all open channels.
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"""
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return [(RecvChannel(cid), SendChannel(cid))
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for cid in _interpreters.channel_list_all()]
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_NOT_SET = object()
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class RecvChannel:
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"""
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The RecvChannel object represents
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a receiving channel.
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"""
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def __init__(self, id):
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self._id = id
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def recv(self, *, _delay=10 / 1000): # 10 milliseconds
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"""
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Get the next object from the channel,
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and wait if none have been sent.
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Associate the interpreter with the channel.
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"""
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import time
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sentinel = object()
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obj = _interpreters.channel_recv(self._id, sentinel)
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while obj is sentinel:
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time.sleep(_delay)
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obj = _interpreters.channel_recv(self._id, sentinel)
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return obj
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def recv_nowait(self, default=_NOT_SET):
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"""
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Like recv(), but return the default
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instead of waiting.
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This function is blocked by a missing low-level
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implementation of channel_recv_wait().
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"""
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if default is _NOT_SET:
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return _interpreters.channel_recv(self._id)
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else:
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return _interpreters.channel_recv(self._id, default)
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class SendChannel:
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"""
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The SendChannel object represents
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a sending channel.
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"""
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def __init__(self, id):
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self._id = id
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def send(self, obj):
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"""
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Send the object (i.e. its data) to the receiving
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end of the channel and wait. Associate the interpreter
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with the channel.
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"""
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import time
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_interpreters.channel_send(self._id, obj)
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time.sleep(2)
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def send_nowait(self, obj):
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"""
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Like send(), but return False if not received.
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This function is blocked by a missing low-level
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implementation of channel_send_wait().
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"""
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_interpreters.channel_send(self._id, obj)
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return False
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@ -0,0 +1,535 @@
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import contextlib
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import os
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import threading
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from textwrap import dedent
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import unittest
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import time
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import _xxsubinterpreters as _interpreters
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from test.support import interpreters
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def _captured_script(script):
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r, w = os.pipe()
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indented = script.replace('\n', '\n ')
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wrapped = dedent(f"""
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import contextlib
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with open({w}, 'w') as spipe:
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with contextlib.redirect_stdout(spipe):
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{indented}
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""")
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return wrapped, open(r)
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def clean_up_interpreters():
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for interp in interpreters.list_all():
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if interp.id == 0: # main
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continue
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try:
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interp.close()
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except RuntimeError:
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pass # already destroyed
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def _run_output(interp, request, shared=None):
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script, rpipe = _captured_script(request)
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with rpipe:
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interp.run(script)
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return rpipe.read()
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@contextlib.contextmanager
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def _running(interp):
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r, w = os.pipe()
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def run():
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interp.run(dedent(f"""
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# wait for "signal"
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with open({r}) as rpipe:
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rpipe.read()
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"""))
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t = threading.Thread(target=run)
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t.start()
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yield
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with open(w, 'w') as spipe:
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spipe.write('done')
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t.join()
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class TestBase(unittest.TestCase):
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def tearDown(self):
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clean_up_interpreters()
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class CreateTests(TestBase):
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def test_in_main(self):
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interp = interpreters.create()
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lst = interpreters.list_all()
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self.assertEqual(interp.id, lst[1].id)
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def test_in_thread(self):
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lock = threading.Lock()
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id = None
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interp = interpreters.create()
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lst = interpreters.list_all()
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def f():
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nonlocal id
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id = interp.id
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lock.acquire()
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lock.release()
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t = threading.Thread(target=f)
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with lock:
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t.start()
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t.join()
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self.assertEqual(interp.id, lst[1].id)
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def test_in_subinterpreter(self):
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main, = interpreters.list_all()
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interp = interpreters.create()
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out = _run_output(interp, dedent("""
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from test.support import interpreters
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interp = interpreters.create()
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print(interp)
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"""))
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interp2 = out.strip()
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self.assertEqual(len(set(interpreters.list_all())), len({main, interp, interp2}))
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def test_after_destroy_all(self):
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before = set(interpreters.list_all())
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# Create 3 subinterpreters.
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interp_lst = []
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for _ in range(3):
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interps = interpreters.create()
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interp_lst.append(interps)
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# Now destroy them.
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for interp in interp_lst:
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interp.close()
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# Finally, create another.
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interp = interpreters.create()
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self.assertEqual(len(set(interpreters.list_all())), len(before | {interp}))
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def test_after_destroy_some(self):
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before = set(interpreters.list_all())
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# Create 3 subinterpreters.
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interp1 = interpreters.create()
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interp2 = interpreters.create()
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interp3 = interpreters.create()
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# Now destroy 2 of them.
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interp1.close()
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interp2.close()
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# Finally, create another.
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interp = interpreters.create()
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self.assertEqual(len(set(interpreters.list_all())), len(before | {interp3, interp}))
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class GetCurrentTests(TestBase):
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def test_main(self):
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main_interp_id = _interpreters.get_main()
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cur_interp_id = interpreters.get_current().id
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self.assertEqual(cur_interp_id, main_interp_id)
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def test_subinterpreter(self):
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main = _interpreters.get_main()
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interp = interpreters.create()
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out = _run_output(interp, dedent("""
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from test.support import interpreters
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cur = interpreters.get_current()
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print(cur)
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"""))
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cur = out.strip()
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self.assertNotEqual(cur, main)
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class ListAllTests(TestBase):
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def test_initial(self):
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interps = interpreters.list_all()
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self.assertEqual(1, len(interps))
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def test_after_creating(self):
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main = interpreters.get_current()
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first = interpreters.create()
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second = interpreters.create()
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ids = []
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for interp in interpreters.list_all():
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ids.append(interp.id)
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self.assertEqual(ids, [main.id, first.id, second.id])
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def test_after_destroying(self):
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main = interpreters.get_current()
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first = interpreters.create()
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second = interpreters.create()
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first.close()
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ids = []
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for interp in interpreters.list_all():
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ids.append(interp.id)
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self.assertEqual(ids, [main.id, second.id])
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class TestInterpreterId(TestBase):
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def test_in_main(self):
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main = interpreters.get_current()
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self.assertEqual(0, main.id)
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def test_with_custom_num(self):
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interp = interpreters.Interpreter(1)
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self.assertEqual(1, interp.id)
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def test_for_readonly_property(self):
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interp = interpreters.Interpreter(1)
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with self.assertRaises(AttributeError):
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interp.id = 2
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class TestInterpreterIsRunning(TestBase):
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def test_main(self):
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main = interpreters.get_current()
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self.assertTrue(main.is_running())
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def test_subinterpreter(self):
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interp = interpreters.create()
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self.assertFalse(interp.is_running())
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with _running(interp):
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self.assertTrue(interp.is_running())
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self.assertFalse(interp.is_running())
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def test_from_subinterpreter(self):
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interp = interpreters.create()
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out = _run_output(interp, dedent(f"""
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import _xxsubinterpreters as _interpreters
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if _interpreters.is_running({interp.id}):
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print(True)
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else:
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print(False)
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"""))
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self.assertEqual(out.strip(), 'True')
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def test_already_destroyed(self):
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interp = interpreters.create()
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interp.close()
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with self.assertRaises(RuntimeError):
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interp.is_running()
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class TestInterpreterDestroy(TestBase):
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def test_basic(self):
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interp1 = interpreters.create()
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interp2 = interpreters.create()
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interp3 = interpreters.create()
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self.assertEqual(4, len(interpreters.list_all()))
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interp2.close()
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self.assertEqual(3, len(interpreters.list_all()))
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def test_all(self):
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before = set(interpreters.list_all())
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interps = set()
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for _ in range(3):
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interp = interpreters.create()
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interps.add(interp)
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self.assertEqual(len(set(interpreters.list_all())), len(before | interps))
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for interp in interps:
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interp.close()
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self.assertEqual(len(set(interpreters.list_all())), len(before))
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def test_main(self):
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main, = interpreters.list_all()
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with self.assertRaises(RuntimeError):
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main.close()
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def f():
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with self.assertRaises(RuntimeError):
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main.close()
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t = threading.Thread(target=f)
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t.start()
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t.join()
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def test_already_destroyed(self):
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interp = interpreters.create()
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interp.close()
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with self.assertRaises(RuntimeError):
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interp.close()
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def test_from_current(self):
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main, = interpreters.list_all()
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interp = interpreters.create()
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script = dedent(f"""
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from test.support import interpreters
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try:
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main = interpreters.get_current()
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main.close()
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except RuntimeError:
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pass
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""")
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interp.run(script)
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self.assertEqual(len(set(interpreters.list_all())), len({main, interp}))
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def test_from_sibling(self):
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main, = interpreters.list_all()
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interp1 = interpreters.create()
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script = dedent(f"""
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from test.support import interpreters
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interp2 = interpreters.create()
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interp2.close()
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""")
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interp1.run(script)
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self.assertEqual(len(set(interpreters.list_all())), len({main, interp1}))
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def test_from_other_thread(self):
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interp = interpreters.create()
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def f():
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interp.close()
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t = threading.Thread(target=f)
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t.start()
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t.join()
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def test_still_running(self):
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main, = interpreters.list_all()
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interp = interpreters.create()
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with _running(interp):
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with self.assertRaises(RuntimeError):
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interp.close()
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self.assertTrue(interp.is_running())
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class TestInterpreterRun(TestBase):
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SCRIPT = dedent("""
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with open('{}', 'w') as out:
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out.write('{}')
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""")
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FILENAME = 'spam'
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def setUp(self):
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super().setUp()
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self.interp = interpreters.create()
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self._fs = None
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def tearDown(self):
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if self._fs is not None:
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self._fs.close()
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super().tearDown()
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@property
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def fs(self):
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if self._fs is None:
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self._fs = FSFixture(self)
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return self._fs
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def test_success(self):
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script, file = _captured_script('print("it worked!", end="")')
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with file:
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self.interp.run(script)
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out = file.read()
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self.assertEqual(out, 'it worked!')
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def test_in_thread(self):
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script, file = _captured_script('print("it worked!", end="")')
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with file:
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def f():
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self.interp.run(script)
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t = threading.Thread(target=f)
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t.start()
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t.join()
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||||
out = file.read()
|
||||
|
||||
self.assertEqual(out, 'it worked!')
|
||||
|
||||
@unittest.skipUnless(hasattr(os, 'fork'), "test needs os.fork()")
|
||||
def test_fork(self):
|
||||
import tempfile
|
||||
with tempfile.NamedTemporaryFile('w+') as file:
|
||||
file.write('')
|
||||
file.flush()
|
||||
|
||||
expected = 'spam spam spam spam spam'
|
||||
script = dedent(f"""
|
||||
import os
|
||||
try:
|
||||
os.fork()
|
||||
except RuntimeError:
|
||||
with open('{file.name}', 'w') as out:
|
||||
out.write('{expected}')
|
||||
""")
|
||||
self.interp.run(script)
|
||||
|
||||
file.seek(0)
|
||||
content = file.read()
|
||||
self.assertEqual(content, expected)
|
||||
|
||||
def test_already_running(self):
|
||||
with _running(self.interp):
|
||||
with self.assertRaises(RuntimeError):
|
||||
self.interp.run('print("spam")')
|
||||
|
||||
def test_bad_script(self):
|
||||
with self.assertRaises(TypeError):
|
||||
self.interp.run(10)
|
||||
|
||||
def test_bytes_for_script(self):
|
||||
with self.assertRaises(TypeError):
|
||||
self.interp.run(b'print("spam")')
|
||||
|
||||
|
||||
class TestIsShareable(TestBase):
|
||||
|
||||
def test_default_shareables(self):
|
||||
shareables = [
|
||||
# singletons
|
||||
None,
|
||||
# builtin objects
|
||||
b'spam',
|
||||
'spam',
|
||||
10,
|
||||
-10,
|
||||
]
|
||||
for obj in shareables:
|
||||
with self.subTest(obj):
|
||||
self.assertTrue(
|
||||
interpreters.is_shareable(obj))
|
||||
|
||||
def test_not_shareable(self):
|
||||
class Cheese:
|
||||
def __init__(self, name):
|
||||
self.name = name
|
||||
def __str__(self):
|
||||
return self.name
|
||||
|
||||
class SubBytes(bytes):
|
||||
"""A subclass of a shareable type."""
|
||||
|
||||
not_shareables = [
|
||||
# singletons
|
||||
True,
|
||||
False,
|
||||
NotImplemented,
|
||||
...,
|
||||
# builtin types and objects
|
||||
type,
|
||||
object,
|
||||
object(),
|
||||
Exception(),
|
||||
100.0,
|
||||
# user-defined types and objects
|
||||
Cheese,
|
||||
Cheese('Wensleydale'),
|
||||
SubBytes(b'spam'),
|
||||
]
|
||||
for obj in not_shareables:
|
||||
with self.subTest(repr(obj)):
|
||||
self.assertFalse(
|
||||
interpreters.is_shareable(obj))
|
||||
|
||||
|
||||
class TestChannel(TestBase):
|
||||
|
||||
def test_create_cid(self):
|
||||
r, s = interpreters.create_channel()
|
||||
self.assertIsInstance(r, interpreters.RecvChannel)
|
||||
self.assertIsInstance(s, interpreters.SendChannel)
|
||||
|
||||
def test_sequential_ids(self):
|
||||
before = interpreters.list_all_channels()
|
||||
channels1 = interpreters.create_channel()
|
||||
channels2 = interpreters.create_channel()
|
||||
channels3 = interpreters.create_channel()
|
||||
after = interpreters.list_all_channels()
|
||||
|
||||
self.assertEqual(len(set(after) - set(before)),
|
||||
len({channels1, channels2, channels3}))
|
||||
|
||||
|
||||
class TestSendRecv(TestBase):
|
||||
|
||||
def test_send_recv_main(self):
|
||||
r, s = interpreters.create_channel()
|
||||
orig = b'spam'
|
||||
s.send(orig)
|
||||
obj = r.recv()
|
||||
|
||||
self.assertEqual(obj, orig)
|
||||
self.assertIsNot(obj, orig)
|
||||
|
||||
def test_send_recv_same_interpreter(self):
|
||||
interp = interpreters.create()
|
||||
out = _run_output(interp, dedent("""
|
||||
from test.support import interpreters
|
||||
r, s = interpreters.create_channel()
|
||||
orig = b'spam'
|
||||
s.send(orig)
|
||||
obj = r.recv()
|
||||
assert obj is not orig
|
||||
assert obj == orig
|
||||
"""))
|
||||
|
||||
def test_send_recv_different_threads(self):
|
||||
r, s = interpreters.create_channel()
|
||||
|
||||
def f():
|
||||
while True:
|
||||
try:
|
||||
obj = r.recv()
|
||||
break
|
||||
except interpreters.ChannelEmptyError:
|
||||
time.sleep(0.1)
|
||||
s.send(obj)
|
||||
t = threading.Thread(target=f)
|
||||
t.start()
|
||||
|
||||
s.send(b'spam')
|
||||
t.join()
|
||||
obj = r.recv()
|
||||
|
||||
self.assertEqual(obj, b'spam')
|
||||
|
||||
def test_send_recv_nowait_main(self):
|
||||
r, s = interpreters.create_channel()
|
||||
orig = b'spam'
|
||||
s.send(orig)
|
||||
obj = r.recv_nowait()
|
||||
|
||||
self.assertEqual(obj, orig)
|
||||
self.assertIsNot(obj, orig)
|
||||
|
||||
def test_send_recv_nowait_same_interpreter(self):
|
||||
interp = interpreters.create()
|
||||
out = _run_output(interp, dedent("""
|
||||
from test.support import interpreters
|
||||
r, s = interpreters.create_channel()
|
||||
orig = b'spam'
|
||||
s.send(orig)
|
||||
obj = r.recv_nowait()
|
||||
assert obj is not orig
|
||||
assert obj == orig
|
||||
"""))
|
||||
|
||||
r, s = interpreters.create_channel()
|
||||
|
||||
def f():
|
||||
while True:
|
||||
try:
|
||||
obj = r.recv_nowait()
|
||||
break
|
||||
except _interpreters.ChannelEmptyError:
|
||||
time.sleep(0.1)
|
||||
s.send(obj)
|
||||
|
|
@ -0,0 +1,2 @@
|
|||
PEP 554 for use in the test suite.
|
||||
(Patch By Joannah Nanjekye)
|
||||
Loading…
Reference in New Issue