done

lib/python3.11/site-packages/narwhals/_duckdb/expr_str.py

@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from narwhals._duckdb.utils import F, lit
+from narwhals._sql.expr_str import SQLExprStringNamespace
+from narwhals._utils import not_implemented
+
+if TYPE_CHECKING:
+    from narwhals._duckdb.expr import DuckDBExpr
+
+
+class DuckDBExprStringNamespace(SQLExprStringNamespace["DuckDBExpr"]):
+    def to_datetime(self, format: str | None) -> DuckDBExpr:
+        if format is None:
+            msg = "Cannot infer format with DuckDB backend, please specify `format` explicitly."
+            raise NotImplementedError(msg)
+
+        return self.compliant._with_elementwise(
+            lambda expr: F("strptime", expr, lit(format))
+        )
+
+    def to_date(self, format: str | None) -> DuckDBExpr:
+        if format is not None:
+            return self.to_datetime(format=format).dt.date()
+
+        compliant_expr = self.compliant
+        return compliant_expr.cast(compliant_expr._version.dtypes.Date())
+
+    replace = not_implemented()