Trait TryFromObject

pub trait TryFromObject: Sized {
    // Required method
    fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self>;
}

Implemented by any type that can be created from a Python object.

Any type that implements TryFromObject is automatically FromArgs, and so can be accepted as a argument to a built-in function.

Required Methods

fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self>

Attempt to convert a Python object to a value of this type.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl TryFromObject for Option<Gid>

fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self>

impl TryFromObject for Option<Uid>

fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self>

impl TryFromObject for f32

fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self>

impl TryFromObject for f64

fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self>

impl TryFromObject for Duration

fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self>

impl TryFromObject for BorrowedFd<'_>

fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self>

impl<T: TryFromObject> TryFromObject for Option<T>

fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self>

Implementors

impl TryFromObject for ExceptionCtor

impl TryFromObject for ArgAsciiBuffer

impl TryFromObject for ArgStrOrBytesLike

impl TryFromObject for FsPath

impl TryFromObject for ArgCallable

impl TryFromObject for ArgIndex

impl TryFromObject for ArgIntoBool

impl TryFromObject for ArgIntoComplex

impl TryFromObject for ArgIntoFloat

impl TryFromObject for ArgMapping

impl TryFromObject for PyObjectRef

impl TryFromObject for OsPath

impl TryFromObject for PyIter<PyObjectRef>

impl TryFromObject for Fildes

impl<A, B> TryFromObject for Either<A, B>

where A: TryFromObject, B: TryFromObject,

This allows a builtin method to accept arguments that may be one of two types, raising a TypeError if it is neither.

Example

use rustpython_vm::VirtualMachine;
use rustpython_vm::builtins::{PyStrRef, PyIntRef};
use rustpython_vm::function::Either;

fn do_something(arg: Either<PyIntRef, PyStrRef>, vm: &VirtualMachine) {
    match arg {
        Either::A(int)=> {
            // do something with int
        }
        Either::B(string) => {
            // do something with string
        }
    }
}

impl<T> TryFromObject for ArgIterable<T>

where T: TryFromObject,

impl<T> TryFromObject for ArgPrimitiveIndex<T>

where T: PrimInt + for<'a> TryFrom<&'a BigInt>,

impl<T> TryFromObject for PyRef<T>

where T: PyPayload,

impl<T: PyPayload> TryFromObject for PyRefExact<T>

impl<T: TryFromObject> TryFromObject for PyArithmeticValue<T>

impl<T: TryFromObject> TryFromObject for ArgSequence<T>

impl<T: for<'a> TryFromBorrowedObject<'a>> TryFromObject for T

Rust-side only version of TryFromObject to reduce unnecessary Rc::clone