Struct DowncastError

pub struct DowncastError<'a, 'py> {
    from: Borrowed<'a, 'py, PyAny>,
    to: Cow<'static, str>,
}

Error that indicates a failure to convert a PyAny to a more specific Python type.

Fields

from: Borrowed<'a, 'py, PyAny>

to: Cow<'static, str>

Implementations

impl<'a, 'py> DowncastError<'a, 'py>

pub fn new( from: &'a Bound<'py, PyAny>, to: impl Into<Cow<'static, str>>, ) -> Self

Create a new PyDowncastError representing a failure to convert the object from into the type named in to.

pub(crate) fn new_from_borrowed( from: Borrowed<'a, 'py, PyAny>, to: impl Into<Cow<'static, str>>, ) -> Self

Trait Implementations

impl<'a, 'py> Debug for DowncastError<'a, 'py>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for DowncastError<'_, '_>

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Error for DowncastError<'_, '_>

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

#[doc(hidden)] fn type_id(&self, _: Internal) -> TypeId

where Self: 'static,

🔬This is a nightly-only experimental API. (error_type_id)

Gets the TypeId of self.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<DowncastError<'_, '_>> for PyErr

Convert DowncastError to Python TypeError.

fn from(err: DowncastError<'_, '_>) -> PyErr

Converts to this type from the input type.