doc(): to_numpy advice for when working with Utf8 (#3072)

pola-rs · Apr 12, 2022 · a7e27b0 · a7e27b0
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diff --git a/py-polars/polars/internals/frame.py b/py-polars/polars/internals/frame.py
@@ -1426,6 +1426,10 @@ def to_numpy(self) -> np.ndarray:
         Convert DataFrame to a 2d numpy array.
         This operation clones data.
 
+        Notes
+        -----
+        If you're attempting to convert Utf8 to an array you'll need to install `pyarrow`.
+
         Examples
         --------
 

diff --git a/py-polars/polars/internals/series.py b/py-polars/polars/internals/series.py
@@ -2102,6 +2102,10 @@ def to_numpy(
 
         If you want a zero-copy view and know what you are doing, use `.view()`.
 
+        Notes
+        -----
+        If you are attempting to convert Utf8 to an array you'll need to install `pyarrow`.
+
         Examples
         --------
         >>> s = pl.Series("a", [1, 2, 3])