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This pull request is a follow-up to https://github.com/python/mypy/issues/7214. In short, within that mypy issue, we found it would be helpful to determine between contextmanagers that can "swallow" exceptions vs ones that can't. This helps prevent some false positive when using flags that analyze control flow such as `--warn-unreachable`. To do this, Jelle proposed assuming that only contextmanagers where the `__exit__` returns `bool` are assumed to swallow exceptions. This unfortunately required the following typeshed changes: 1. The typing.IO, threading.Lock, and concurrent.futures.Executor were all modified so `__exit__` returns `Optional[None]` instead of None -- along with all of their subclasses. I believe these three types are meant to be subclassed, so I felt picking the more general type was correct. 2. There were also a few concrete types (e.g. see socketserver, subprocess, ftplib...) that I modified to return `None` -- I checked the source code, and these all seem to return None (and don't appear to be meant to be subclassable). 3. contextlib.suppress was changed to return bool. I also double-checked the unittest modules and modified a subset of those contextmanagers, leaving ones like `_AssertRaisesContext` alone.
188 lines
6.2 KiB
Python
188 lines
6.2 KiB
Python
# Stubs for threading
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from typing import (
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Any, Callable, Iterable, List, Mapping, Optional, Tuple, Type, Union,
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TypeVar,
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)
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from types import FrameType, TracebackType
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import sys
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# TODO recursive type
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_TF = Callable[[FrameType, str, Any], Optional[Callable[..., Any]]]
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_PF = Callable[[FrameType, str, Any], None]
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_T = TypeVar('_T')
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def active_count() -> int: ...
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if sys.version_info < (3,):
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def activeCount() -> int: ...
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def current_thread() -> Thread: ...
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def currentThread() -> Thread: ...
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if sys.version_info >= (3,):
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def get_ident() -> int: ...
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def enumerate() -> List[Thread]: ...
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if sys.version_info >= (3, 4):
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def main_thread() -> Thread: ...
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def settrace(func: _TF) -> None: ...
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def setprofile(func: _PF) -> None: ...
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def stack_size(size: int = ...) -> int: ...
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if sys.version_info >= (3,):
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TIMEOUT_MAX: float
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class ThreadError(Exception): ...
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class local(object):
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def __getattribute__(self, name: str) -> Any: ...
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def __setattr__(self, name: str, value: Any) -> None: ...
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def __delattr__(self, name: str) -> None: ...
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class Thread:
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name: str
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ident: Optional[int]
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daemon: bool
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if sys.version_info >= (3,):
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def __init__(self, group: None = ...,
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target: Optional[Callable[..., Any]] = ...,
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name: Optional[str] = ...,
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args: Iterable = ...,
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kwargs: Mapping[str, Any] = ...,
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*, daemon: Optional[bool] = ...) -> None: ...
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else:
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def __init__(self, group: None = ...,
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target: Optional[Callable[..., Any]] = ...,
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name: Optional[str] = ...,
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args: Iterable = ...,
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kwargs: Mapping[str, Any] = ...) -> None: ...
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def start(self) -> None: ...
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def run(self) -> None: ...
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def join(self, timeout: Optional[float] = ...) -> None: ...
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def getName(self) -> str: ...
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def setName(self, name: str) -> None: ...
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def is_alive(self) -> bool: ...
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def isAlive(self) -> bool: ...
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def isDaemon(self) -> bool: ...
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def setDaemon(self, daemonic: bool) -> None: ...
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class _DummyThread(Thread): ...
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class Lock:
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def __init__(self) -> None: ...
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def __enter__(self) -> bool: ...
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def __exit__(self, exc_type: Optional[Type[BaseException]],
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exc_val: Optional[BaseException],
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exc_tb: Optional[TracebackType]) -> Optional[bool]: ...
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if sys.version_info >= (3,):
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def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
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else:
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def acquire(self, blocking: bool = ...) -> bool: ...
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def release(self) -> None: ...
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def locked(self) -> bool: ...
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class _RLock:
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def __init__(self) -> None: ...
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def __enter__(self) -> bool: ...
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def __exit__(self, exc_type: Optional[Type[BaseException]],
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exc_val: Optional[BaseException],
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exc_tb: Optional[TracebackType]) -> Optional[bool]: ...
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if sys.version_info >= (3,):
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def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
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else:
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def acquire(self, blocking: bool = ...) -> bool: ...
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def release(self) -> None: ...
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RLock = _RLock
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class Condition:
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def __init__(self, lock: Union[Lock, _RLock, None] = ...) -> None: ...
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def __enter__(self) -> bool: ...
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def __exit__(self, exc_type: Optional[Type[BaseException]],
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exc_val: Optional[BaseException],
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exc_tb: Optional[TracebackType]) -> Optional[bool]: ...
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if sys.version_info >= (3,):
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def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
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else:
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def acquire(self, blocking: bool = ...) -> bool: ...
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def release(self) -> None: ...
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def wait(self, timeout: Optional[float] = ...) -> bool: ...
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if sys.version_info >= (3,):
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def wait_for(self, predicate: Callable[[], _T],
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timeout: Optional[float] = ...) -> _T: ...
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def notify(self, n: int = ...) -> None: ...
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def notify_all(self) -> None: ...
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def notifyAll(self) -> None: ...
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class Semaphore:
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def __init__(self, value: int = ...) -> None: ...
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def __enter__(self) -> bool: ...
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def __exit__(self, exc_type: Optional[Type[BaseException]],
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exc_val: Optional[BaseException],
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exc_tb: Optional[TracebackType]) -> Optional[bool]: ...
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if sys.version_info >= (3,):
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def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
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else:
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def acquire(self, blocking: bool = ...) -> bool: ...
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def release(self) -> None: ...
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class BoundedSemaphore:
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def __init__(self, value: int = ...) -> None: ...
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def __enter__(self) -> bool: ...
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def __exit__(self, exc_type: Optional[Type[BaseException]],
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exc_val: Optional[BaseException],
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exc_tb: Optional[TracebackType]) -> Optional[bool]: ...
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if sys.version_info >= (3,):
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def acquire(self, blocking: bool = ..., timeout: float = ...) -> bool: ...
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else:
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def acquire(self, blocking: bool = ...) -> bool: ...
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def release(self) -> None: ...
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class Event:
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def __init__(self) -> None: ...
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def is_set(self) -> bool: ...
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if sys.version_info < (3,):
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def isSet(self) -> bool: ...
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def set(self) -> None: ...
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def clear(self) -> None: ...
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def wait(self, timeout: Optional[float] = ...) -> bool: ...
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class Timer(Thread):
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if sys.version_info >= (3,):
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def __init__(self, interval: float, function: Callable[..., None],
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args: Optional[Iterable[Any]] = ...,
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kwargs: Optional[Mapping[str, Any]] = ...) -> None: ...
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else:
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def __init__(self, interval: float, function: Callable[..., None],
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args: Iterable[Any] = ...,
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kwargs: Mapping[str, Any] = ...) -> None: ...
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def cancel(self) -> None: ...
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if sys.version_info >= (3,):
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class Barrier:
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parties: int
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n_waiting: int
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broken: bool
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def __init__(self, parties: int, action: Optional[Callable[[], None]] = ...,
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timeout: Optional[float] = ...) -> None: ...
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def wait(self, timeout: Optional[float] = ...) -> int: ...
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def reset(self) -> None: ...
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def abort(self) -> None: ...
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class BrokenBarrierError(RuntimeError): ...
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