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gh-150579: use lazy imports for concurrent.futures #150585

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gh-150579: use lazy imports for concurrent.futures #150585

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21 changes: 4 additions & 17 deletions Lib/concurrent/futures/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,9 @@
wait,
as_completed)

lazy from .process import ProcessPoolExecutor
lazy from .thread import ThreadPoolExecutor

__all__ = [
'FIRST_COMPLETED',
'FIRST_EXCEPTION',
Expand All @@ -40,26 +43,10 @@
_interpreters = None

if _interpreters:
lazy from .interpreter import InterpreterPoolExecutor
__all__.append('InterpreterPoolExecutor')


def __dir__():
return __all__ + ['__author__', '__doc__']


def __getattr__(name):
global ProcessPoolExecutor, ThreadPoolExecutor, InterpreterPoolExecutor

if name == 'ProcessPoolExecutor':
from .process import ProcessPoolExecutor
return ProcessPoolExecutor

if name == 'ThreadPoolExecutor':
from .thread import ThreadPoolExecutor
return ThreadPoolExecutor

if _interpreters and name == 'InterpreterPoolExecutor':
from .interpreter import InterpreterPoolExecutor
return InterpreterPoolExecutor

raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
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