feat: dask expr dunder methods

narwhals/_dask/expr.py

@@ -149,6 +149,14 @@ def __add__(self, other: Any) -> Self:
             returns_scalar=False,
         )
 
+    def __radd__(self, other: Any) -> Self:
+        return self._from_call(
+            lambda _input, other: _input.__radd__(other),
+            "__radd__",
+            other,
+            returns_scalar=False,
+        )
+
     def __sub__(self, other: Any) -> Self:
         return self._from_call(
             lambda _input, other: _input.__sub__(other),
@@ -157,6 +165,14 @@ def __sub__(self, other: Any) -> Self:
             returns_scalar=False,
         )
 
+    def __rsub__(self, other: Any) -> Self:
+        return self._from_call(
+            lambda _input, other: _input.__rsub__(other),
+            "__rsub__",
+            other,
+            returns_scalar=False,
+        )
+
     def __mul__(self, other: Any) -> Self:
         return self._from_call(
             lambda _input, other: _input.__mul__(other),
@@ -165,6 +181,78 @@ def __mul__(self, other: Any) -> Self:
             returns_scalar=False,
         )
 
+    def __rmul__(self, other: Any) -> Self:
+        return self._from_call(
+            lambda _input, other: _input.__rmul__(other),
+            "__rmul__",
+            other,
+            returns_scalar=False,
+        )
+
+    def __truediv__(self, other: Any) -> Self:
+        return self._from_call(
+            lambda _input, other: _input.__truediv__(other),
+            "__truediv__",
+            other,
+            returns_scalar=False,
+        )
+
+    def __rtruediv__(self, other: Any) -> Self:
+        return self._from_call(
+            lambda _input, other: _input.__rtruediv__(other),
+            "__rtruediv__",
+            other,
+            returns_scalar=False,
+        )
+
+    def __floordiv__(self, other: Any) -> Self:
+        return self._from_call(
+            lambda _input, other: _input.__floordiv__(other),
+            "__floordiv__",
+            other,
+            returns_scalar=False,
+        )
+
+    def __rfloordiv__(self, other: Any) -> Self:
+        return self._from_call(
+            lambda _input, other: _input.__rfloordiv__(other),
+            "__rfloordiv__",
+            other,
+            returns_scalar=False,
+        )
+
+    def __pow__(self, other: Any) -> Self:
+        return self._from_call(
+            lambda _input, other: _input.__pow__(other),
+            "__pow__",
+            other,
+            returns_scalar=False,
+        )
+
+    def __rpow__(self, other: Any) -> Self:
+        return self._from_call(
+            lambda _input, other: _input.__rpow__(other),
+            "__rpow__",
+            other,
+            returns_scalar=False,
+        )
+
+    def __mod__(self, other: Any) -> Self:
+        return self._from_call(
+            lambda _input, other: _input.__mod__(other),
+            "__mod__",
+            other,
+            returns_scalar=False,
+        )
+
+    def __rmod__(self, other: Any) -> Self:
+        return self._from_call(
+            lambda _input, other: _input.__rmod__(other),
+            "__rmod__",
+            other,
+            returns_scalar=False,
+        )
+
     def __eq__(self, other: DaskExpr) -> Self:  # type: ignore[override]
         return self._from_call(
             lambda _input, other: _input.__eq__(other),
@@ -221,6 +309,14 @@ def __and__(self, other: DaskExpr) -> Self:
             returns_scalar=False,
         )
 
+    def __rand__(self, other: DaskExpr) -> Self:  # pragma: no cover
+        return self._from_call(
+            lambda _input, other: _input.__rand__(other),
+            "__rand__",
+            other,
+            returns_scalar=False,
+        )
+
     def __or__(self, other: DaskExpr) -> Self:
         return self._from_call(
             lambda _input, other: _input.__or__(other),
@@ -229,6 +325,14 @@ def __or__(self, other: DaskExpr) -> Self:
             returns_scalar=False,
         )
 
+    def __ror__(self, other: DaskExpr) -> Self:  # pragma: no cover
+        return self._from_call(
+            lambda _input, other: _input.__ror__(other),
+            "__ror__",
+            other,
+            returns_scalar=False,
+        )
+
     def mean(self) -> Self:
         return self._from_call(
             lambda _input: _input.mean(),

tests/expr_and_series/arithmetic_test.py

@@ -28,12 +28,6 @@ def test_arithmetic(
     constructor: Any,
     request: Any,
 ) -> None:
-    if "dask" in str(constructor) and attr not in [
-        "__add__",
-        "__sub__",
-        "__mul__",
-    ]:
-        request.applymarker(pytest.mark.xfail)
     if attr == "__mod__" and any(
         x in str(constructor) for x in ["pandas_pyarrow", "pyarrow_table", "modin"]
     ):
@@ -64,8 +58,6 @@ def test_right_arithmetic(
     constructor: Any,
     request: Any,
 ) -> None:
-    if "dask" in str(constructor):
-        request.applymarker(pytest.mark.xfail)
     if attr == "__rmod__" and any(
         x in str(constructor) for x in ["pandas_pyarrow", "pyarrow_table", "modin"]
     ):