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[python-package] fix type hints on ctypes array converters #5446

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Aug 30, 2022
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[python-package] fix type hints on ctypes array converters #5446

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8 changes: 4 additions & 4 deletions python-package/lightgbm/basic.py
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Original file line number Diff line number Diff line change
Expand Up @@ -255,31 +255,31 @@ def _data_to_2d_numpy(data: Any, dtype: type = np.float32, name: str = 'list') -
"It should be list of lists, numpy 2-D array or pandas DataFrame")


def cfloat32_array_to_numpy(cptr: ctypes.POINTER, length: int) -> np.ndarray:
def cfloat32_array_to_numpy(cptr: Any, length: int) -> np.ndarray:
"""Convert a ctypes float pointer array to a numpy array."""
if isinstance(cptr, ctypes.POINTER(ctypes.c_float)):
return np.ctypeslib.as_array(cptr, shape=(length,)).copy()
else:
raise RuntimeError('Expected float pointer')


def cfloat64_array_to_numpy(cptr: ctypes.POINTER, length: int) -> np.ndarray:
def cfloat64_array_to_numpy(cptr: Any, length: int) -> np.ndarray:
"""Convert a ctypes double pointer array to a numpy array."""
if isinstance(cptr, ctypes.POINTER(ctypes.c_double)):
return np.ctypeslib.as_array(cptr, shape=(length,)).copy()
else:
raise RuntimeError('Expected double pointer')


def cint32_array_to_numpy(cptr: ctypes.POINTER, length: int) -> np.ndarray:
def cint32_array_to_numpy(cptr: Any, length: int) -> np.ndarray:
"""Convert a ctypes int pointer array to a numpy array."""
if isinstance(cptr, ctypes.POINTER(ctypes.c_int32)):
return np.ctypeslib.as_array(cptr, shape=(length,)).copy()
else:
raise RuntimeError('Expected int32 pointer')


def cint64_array_to_numpy(cptr: ctypes.POINTER, length: int) -> np.ndarray:
def cint64_array_to_numpy(cptr: Any, length: int) -> np.ndarray:
"""Convert a ctypes int pointer array to a numpy array."""
if isinstance(cptr, ctypes.POINTER(ctypes.c_int64)):
return np.ctypeslib.as_array(cptr, shape=(length,)).copy()
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