Fix Series.str_concat (#1785)

pola-rs · Nov 15, 2021 · f0c2aef · f0c2aef
1 parent 4c4a783
commit f0c2aef
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diff --git a/py-polars/polars/eager/series.py b/py-polars/polars/eager/series.py
@@ -2967,11 +2967,12 @@ def str_concat(self, delimiter: str = "-") -> "Series":  # type: ignore
         Series of dtype Utf8
 
         Examples
-        >>> assert pl.Series([1, None, 2]).str_concat("-")[0] == "1-null-2"
+        >>> pl.Series([1, None, 2]).str_concat("-")[0]
+        "1-null-2"
 
         """
         return self.to_frame().select(
-            pl.col(self.name).delimiter(delimiter)  # type: ignore
+            pl.col(self.name).str_concat(delimiter)  # type: ignore
         )[self.name]
 
 

diff --git a/py-polars/tests/test_series.py b/py-polars/tests/test_series.py
@@ -744,3 +744,8 @@ def test_abs():
     s = pl.Series([1, -2, 3, -4])
     assert s.abs().to_list() == [1, 2, 3, 4]
     assert np.abs(s).to_list() == [1, 2, 3, 4]
+
+
+def test_str_concat():
+    s = pl.Series(["1", None, "2"])
+    assert s.str_concat()[0] == "1-null-2"