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- from . import compat
-
- have_greenlet = False
-
- if compat.py3k:
- try:
- import greenlet # noqa F401
- except ImportError:
- pass
- else:
- have_greenlet = True
- from ._concurrency_py3k import await_only
- from ._concurrency_py3k import await_fallback
- from ._concurrency_py3k import greenlet_spawn
- from ._concurrency_py3k import is_exit_exception
- from ._concurrency_py3k import AsyncAdaptedLock
- from ._concurrency_py3k import _util_async_run # noqa F401
- from ._concurrency_py3k import (
- _util_async_run_coroutine_function,
- ) # noqa F401, E501
- from ._concurrency_py3k import asyncio # noqa F401
-
- if not have_greenlet:
-
- asyncio = None # noqa F811
-
- def _not_implemented():
- # this conditional is to prevent pylance from considering
- # greenlet_spawn() etc as "no return" and dimming out code below it
- if have_greenlet:
- return None
-
- if not compat.py3k:
- raise ValueError("Cannot use this function in py2.")
- else:
- raise ValueError(
- "the greenlet library is required to use this function."
- )
-
- def is_exit_exception(e): # noqa F811
- return not isinstance(e, Exception)
-
- def await_only(thing): # noqa F811
- _not_implemented()
-
- def await_fallback(thing): # noqa F81
- return thing
-
- def greenlet_spawn(fn, *args, **kw): # noqa F81
- _not_implemented()
-
- def AsyncAdaptedLock(*args, **kw): # noqa F81
- _not_implemented()
-
- def _util_async_run(fn, *arg, **kw): # noqa F81
- return fn(*arg, **kw)
-
- def _util_async_run_coroutine_function(fn, *arg, **kw): # noqa F81
- _not_implemented()
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