fixup

narwhals/pandas_like/series.py

@@ -31,8 +31,7 @@ def __init__(
             DataFrame this column originates from.
         """
 
-        self._name = series.name
-        assert self._name is not None
+        self._name = str(series.name) if series.name is not None else ""
         self._series = reset_index(series)
         self._implementation = implementation
 
@@ -58,7 +57,11 @@ def _from_series(self, series: Any) -> Self:
 
     @property
     def name(self) -> str:
-        return self._name  # type: ignore[no-any-return]
+        return self._name
+
+    @property
+    def shape(self) -> tuple[int]:
+        return self._series.shape  # type: ignore[no-any-return]
 
     @property
     def series(self) -> Any:

narwhals/polars.py

@@ -217,6 +217,10 @@ def alias(self, name: str) -> Self:
     def name(self) -> str:
         return self._series.name
 
+    @property
+    def shape(self) -> tuple[int]:
+        return self._series.shape
+
     def cast(
         self,
         dtype: DType,  # type: ignore[override]

narwhals/spec/__init__.py

@@ -170,6 +170,10 @@ def alias(self, name: str) -> Self:
     def name(self) -> str:
         ...
 
+    @property
+    def shape(self) -> tuple[int]:
+        ...
+
     def cast(self, dtype: DType) -> Self:
         ...