Merge pull request #1964 from PyO3/pymethods-args
guide: add hints for the signature of pymethods protos
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David Hewitt
GitHub
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64df791741
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@ -22,21 +22,39 @@ The magic methods handled by PyO3 are very similar to the standard Python ones o
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When PyO3 handles a magic method, a couple of changes apply compared to other `#[pymethods]`:
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When PyO3 handles a magic method, a couple of changes apply compared to other `#[pymethods]`:
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- The `#[pyo3(text_signature = "...")]` attribute is not allowed
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- The `#[pyo3(text_signature = "...")]` attribute is not allowed
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- The types of the arguments are fixed according to the magic method
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- The signature is restricted to match the magic method
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The following sections list of all magic methods PyO3 currently handles. The
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given signatures should be interpreted as follows:
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- All methods take a receiver as first argument, shown as `<self>`. It can be
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`&self`, `&mut self` or a `PyCell` reference like `self_: PyRef<Self>` and
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`self_: PyRefMut<Self>`, as described [here](../class.md#inheritance).
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- An optional `Python<'py>` argument is always allowed as the first argument.
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- Return values can be optionally wrapped in `PyResult`.
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- `object` means that any type is allowed that can be extracted from a Python
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object (if argument) or converted to a Python object (if return value).
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- Other types must match what's given, e.g. `pyo3::basic::CompareOp` for
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`__richcmp__`'s second argument.
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- For the comparison and arithmetic methods, extraction errors are not
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propagated as exceptions, but lead to a return of `NotImplemented`.
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- For some magic methods, the return values are not restricted by PyO3, but
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checked by the Python interpreter. For example, `__str__` needs to return a
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string object. This is indicated by `object (Python type)`.
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The following sections list of all magic methods PyO3 currently handles:
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#### Basic object customization
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#### Basic object customization
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- `__str__`
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- `__str__(<self>) -> object (str)`
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- `__repr__`
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- `__repr__(<self>) -> object (str)`
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- `__hash__`
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- `__hash__(<self>) -> isize`
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- `__richcmp__`
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- `__richcmp__(<self>, object, pyo3::basic::CompareOp) -> object`
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- `__getattr__`
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- `__getattr__(<self>, object) -> object`
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- `__setattr__`
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- `__setattr__(<self>, object, object) -> ()`
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- `__delattr__`
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- `__delattr__(<self>, object) -> ()`
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- `__bool__`
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- `__bool__(<self>) -> bool`
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- `__call__`
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- `__call__(<self>, ...) -> object` - here, any argument list can be defined
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as for normal `pymethods`
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##### Example: Callable objects
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##### Example: Callable objects
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@ -105,14 +123,14 @@ hello
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#### Iterable objects
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#### Iterable objects
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- `__iter__`
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- `__iter__(<self>) -> object`
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- `__next__`
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- `__next__(<self>) -> Option<object> or IterNextOutput` ([see details](#returning-a-value-from-iteration))
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#### Awaitable objects
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#### Awaitable objects
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- `__await__`
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- `__await__(<self>) -> object`
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- `__aiter__`
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- `__aiter__(<self>) -> object`
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- `__anext__`
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- `__anext__(<self>) -> Option<object> or IterANextOutput`
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#### Sequence types
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#### Sequence types
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@ -120,68 +138,68 @@ TODO; see [#1884](https://github.com/PyO3/pyo3/issues/1884)
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#### Mapping types
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#### Mapping types
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- `__len__`
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- `__len__(<self>) -> usize`
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- `__contains__`
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- `__contains__(<self>, object) -> bool`
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- `__getitem__`
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- `__getitem__(<self>, object) -> object`
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- `__setitem__`
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- `__setitem__(<self>, object, object) -> ()`
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- `__delitem__`
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- `__delitem__(<self>, object) -> ()`
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#### Descriptors
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#### Descriptors
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- `__get__`
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- `__get__(<self>, object, object) -> object`
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- `__set__`
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- `__set__(<self>, object, object) -> ()`
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- `__delete__`
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- `__delete__(<self>, object) -> ()`
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#### Numeric types
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#### Numeric types
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- `__pos__`
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- `__pos__(<self>) -> object`
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- `__neg__`
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- `__neg__(<self>) -> object`
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- `__abs__`
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- `__abs__(<self>) -> object`
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- `__invert__`
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- `__invert__(<self>) -> object`
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- `__index__`
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- `__index__(<self>) -> object (int)`
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- `__int__`
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- `__int__(<self>) -> object (int)`
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- `__float__`
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- `__float__(<self>) -> object (float)`
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- `__iadd__`
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- `__iadd__(<self>, object) -> ()`
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- `__isub__`
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- `__isub__(<self>, object) -> ()`
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- `__imul__`
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- `__imul__(<self>, object) -> ()`
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- `__imatmul__`
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- `__imatmul__(<self>, object) -> ()`
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- `__itruediv__`
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- `__itruediv__(<self>, object) -> ()`
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- `__ifloordiv__`
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- `__ifloordiv__(<self>, object) -> ()`
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- `__imod__`
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- `__imod__(<self>, object) -> ()`
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- `__ipow__`
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- `__ipow__(<self>, object, object) -> ()`
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- `__ilshift__`
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- `__ilshift__(<self>, object) -> ()`
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- `__irshift__`
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- `__irshift__(<self>, object) -> ()`
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- `__iand__`
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- `__iand__(<self>, object) -> ()`
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- `__ixor__`
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- `__ixor__(<self>, object) -> ()`
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- `__ior__`
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- `__ior__(<self>, object) -> ()`
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- `__add__`
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- `__add__(<self>, object) -> object`
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- `__radd__`
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- `__radd__(<self>, object) -> object`
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- `__sub__`
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- `__sub__(<self>, object) -> object`
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- `__rsub__`
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- `__rsub__(<self>, object) -> object`
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- `__mul__`
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- `__mul__(<self>, object) -> object`
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- `__rmul__`
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- `__rmul__(<self>, object) -> object`
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- `__matmul__`
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- `__matmul__(<self>, object) -> object`
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- `__rmatmul__`
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- `__rmatmul__(<self>, object) -> object`
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- `__floordiv__`
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- `__floordiv__(<self>, object) -> object`
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- `__rfloordiv__`
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- `__rfloordiv__(<self>, object) -> object`
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- `__truediv__`
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- `__truediv__(<self>, object) -> object`
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- `__rtruediv__`
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- `__rtruediv__(<self>, object) -> object`
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- `__divmod__`
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- `__divmod__(<self>, object) -> object`
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- `__rdivmod__`
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- `__rdivmod__(<self>, object) -> object`
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- `__mod__`
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- `__mod__(<self>, object) -> object`
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- `__rmod__`
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- `__rmod__(<self>, object) -> object`
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- `__lshift__`
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- `__lshift__(<self>, object) -> object`
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- `__rlshift__`
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- `__rlshift__(<self>, object) -> object`
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- `__rshift__`
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- `__rshift__(<self>, object) -> object`
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- `__rrshift__`
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- `__rrshift__(<self>, object) -> object`
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- `__and__`
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- `__and__(<self>, object) -> object`
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- `__rand__`
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- `__rand__(<self>, object) -> object`
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- `__xor__`
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- `__xor__(<self>, object) -> object`
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- `__rxor__`
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- `__rxor__(<self>, object) -> object`
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- `__or__`
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- `__or__(<self>, object) -> object`
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- `__ror__`
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- `__ror__(<self>, object) -> object`
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- `__pow__`
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- `__pow__(<self>, object, object) -> object`
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- `__rpow__`
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- `__rpow__(<self>, object, object) -> object`
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#### Buffer objects
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#### Buffer objects
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