Trait pyo3::conversion::PyTryFrom

pub trait PyTryFrom<'v>: Sized + PyNativeType {
    // Required methods
    fn try_from<V: Into<&'v PyAny>>(
        value: V
    ) -> Result<&'v Self, PyDowncastError<'v>>;
    fn try_from_exact<V: Into<&'v PyAny>>(
        value: V
    ) -> Result<&'v Self, PyDowncastError<'v>>;
    unsafe fn try_from_unchecked<V: Into<&'v PyAny>>(value: V) -> &'v Self;
}

👎Deprecated since 0.21.0

Trait implemented by Python object types that allow a checked downcast. If T implements PyTryFrom, we can convert &PyAny to &T.

This trait is similar to std::convert::TryFrom

Required Methods

fn try_from<V: Into<&'v PyAny>>( value: V ) -> Result<&'v Self, PyDowncastError<'v>>

👎Deprecated since 0.21.0: use value.downcast::<T>() instead of T::try_from(value)

Cast from a concrete Python object type to PyObject.

fn try_from_exact<V: Into<&'v PyAny>>( value: V ) -> Result<&'v Self, PyDowncastError<'v>>

👎Deprecated since 0.21.0: use value.downcast_exact::<T>() instead of T::try_from_exact(value)

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

unsafe fn try_from_unchecked<V: Into<&'v PyAny>>(value: V) -> &'v Self

👎Deprecated since 0.21.0: use value.downcast_unchecked::<T>() instead of T::try_from_unchecked(value)

Cast a PyAny to a specific type of PyObject. The caller must have already verified the reference is for this type.

Safety

Callers must ensure that the type is valid or risk type confusion.

Object Safety

This trait is not object safe.

Implementors

impl<'v> PyTryFrom<'v> for PyIterator

impl<'v> PyTryFrom<'v> for PyMapping

impl<'v> PyTryFrom<'v> for PySequence

impl<'v, T> PyTryFrom<'v> for PyCell<T>

where T: 'v + PyClass,

impl<'v, T> PyTryFrom<'v> for T

where T: PyTypeInfo<AsRefTarget = Self> + PyNativeType,