Trait pyo3::PyTryFrom

pub trait PyTryFrom: Sized {
    fn try_from(value: &PyObjectRef) -> Result<&Self, PyDowncastError>;
    fn try_from_exact(value: &PyObjectRef) -> Result<&Self, PyDowncastError>;
    fn try_from_mut(value: &PyObjectRef) -> Result<&mut Self, PyDowncastError>;
    fn try_from_mut_exact(
        value: &PyObjectRef
    ) -> Result<&mut Self, PyDowncastError>;
}

Trait implemented by Python object types that allow a checked downcast. This trait is similar to std::convert::TryFrom

Required Methods

fn try_from(value: &PyObjectRef) -> Result<&Self, PyDowncastError>

Cast from a concrete Python object type to PyObject.

fn try_from_exact(value: &PyObjectRef) -> Result<&Self, PyDowncastError>

Cast from a concrete Python object type to PyObject. With exact type check.

fn try_from_mut(value: &PyObjectRef) -> Result<&mut Self, PyDowncastError>

Cast from a concrete Python object type to PyObject.

fn try_from_mut_exact(value: &PyObjectRef) -> Result<&mut Self, PyDowncastError>

Cast from a concrete Python object type to PyObject. With exact type check.

Implementors

impl PyTryFrom for PySequence

fn try_from(value: &PyObjectRef) -> Result<&PySequence, PyDowncastError>

fn try_from_exact(value: &PyObjectRef) -> Result<&PySequence, PyDowncastError>

fn try_from_mut(value: &PyObjectRef) -> Result<&mut PySequence, PyDowncastError>

fn try_from_mut_exact(     value: &PyObjectRef ) -> Result<&mut PySequence, PyDowncastError>

impl<T> PyTryFrom for T where     T: PyTypeInfo,

fn try_from(value: &PyObjectRef) -> Result<&T, PyDowncastError>

fn try_from_exact(value: &PyObjectRef) -> Result<&T, PyDowncastError>

fn try_from_mut(value: &PyObjectRef) -> Result<&mut T, PyDowncastError>

fn try_from_mut_exact(value: &PyObjectRef) -> Result<&mut T, PyDowncastError>