Trait cpython::PythonObjectWithCheckedDowncast

pub trait PythonObjectWithCheckedDowncast: PythonObject {
    fn downcast_from<'p>(
        _: Python<'p>, 
        _: PyObject
    ) -> Result<Self, PythonObjectDowncastError<'p>>;
    fn downcast_borrow_from<'a, 'p>(
        _: Python<'p>, 
        _: &'a PyObject
    ) -> Result<&'a Self, PythonObjectDowncastError<'p>>;
}

Trait implemented by Python object types that allow a checked downcast.

Required methods

fn downcast_from<'p>(
    _: Python<'p>,
    _: PyObject
) -> Result<Self, PythonObjectDowncastError<'p>>

Cast from PyObject to a concrete Python object type.

fn downcast_borrow_from<'a, 'p>(
    _: Python<'p>,
    _: &'a PyObject
) -> Result<&'a Self, PythonObjectDowncastError<'p>>

Cast from PyObject to a concrete Python object type.

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Implementors

impl PythonObjectWithCheckedDowncast for AssertionError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<AssertionError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a AssertionError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for AttributeError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<AttributeError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a AttributeError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for BaseException

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<BaseException, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a BaseException, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for BlockingIOError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<BlockingIOError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a BlockingIOError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for BrokenPipeError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<BrokenPipeError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a BrokenPipeError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for BufferError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<BufferError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a BufferError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for ChildProcessError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<ChildProcessError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a ChildProcessError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for ConnectionAbortedError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<ConnectionAbortedError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a ConnectionAbortedError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for ConnectionError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<ConnectionError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a ConnectionError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for ConnectionRefusedError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<ConnectionRefusedError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a ConnectionRefusedError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for ConnectionResetError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<ConnectionResetError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a ConnectionResetError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for EOFError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<EOFError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a EOFError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for EnvironmentError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<EnvironmentError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a EnvironmentError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for Exception

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<Exception, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a Exception, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for FileExistsError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<FileExistsError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a FileExistsError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for FileNotFoundError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<FileNotFoundError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a FileNotFoundError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for FloatingPointError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<FloatingPointError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a FloatingPointError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for IOError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<IOError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a IOError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for ImportError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<ImportError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a ImportError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for IndexError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<IndexError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a IndexError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for InterruptedError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<InterruptedError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a InterruptedError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for IsADirectoryError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<IsADirectoryError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a IsADirectoryError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for KeyError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<KeyError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a KeyError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for KeyboardInterrupt

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<KeyboardInterrupt, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a KeyboardInterrupt, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for LookupError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<LookupError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a LookupError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for MemoryError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<MemoryError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a MemoryError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for NameError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<NameError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a NameError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for NotADirectoryError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<NotADirectoryError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a NotADirectoryError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for NotImplementedError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<NotImplementedError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a NotImplementedError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for OSError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<OSError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a OSError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for OverflowError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<OverflowError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a OverflowError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PermissionError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PermissionError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PermissionError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for ProcessLookupError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<ProcessLookupError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a ProcessLookupError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for ReferenceError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<ReferenceError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a ReferenceError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for RuntimeError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<RuntimeError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a RuntimeError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for SyntaxError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<SyntaxError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a SyntaxError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for SystemError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<SystemError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a SystemError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for SystemExit

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<SystemExit, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a SystemExit, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for TimeoutError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<TimeoutError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a TimeoutError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for TypeError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<TypeError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a TypeError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for UnicodeDecodeError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<UnicodeDecodeError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a UnicodeDecodeError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for UnicodeEncodeError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<UnicodeEncodeError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a UnicodeEncodeError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for UnicodeTranslateError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<UnicodeTranslateError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a UnicodeTranslateError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for ValueError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<ValueError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a ValueError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for WindowsError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<WindowsError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a WindowsError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for ZeroDivisionError

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<ZeroDivisionError, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a ZeroDivisionError, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyBool

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PyBool, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyBool, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyBytes

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PyBytes, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyBytes, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyCapsule

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PyCapsule, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyCapsule, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyDict

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PyDict, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyDict, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyFloat

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PyFloat, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyFloat, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyLong

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PyLong, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyLong, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyList

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PyList, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyList, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyModule

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PyModule, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyModule, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyObject

fn downcast_from<'p>(
    _py: Python<'p>,
    obj: PyObject
) -> Result<PyObject, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    _py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyObject, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PySequence

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PySequence, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PySequence, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PySet

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PySet, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PySet, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyTuple

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PyTuple, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyTuple, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyType

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PyType, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyType, PythonObjectDowncastError<'p>>

impl PythonObjectWithCheckedDowncast for PyString

fn downcast_from<'p>(
    py: Python<'p>,
    obj: PyObject
) -> Result<PyString, PythonObjectDowncastError<'p>>

fn downcast_borrow_from<'a, 'p>(
    py: Python<'p>,
    obj: &'a PyObject
) -> Result<&'a PyString, PythonObjectDowncastError<'p>>

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