BUG: Series.from_csv not loading header names, #10483

Author: lewisacidic

doc/source/whatsnew/v0.17.0.txt

@@ -138,3 +138,5 @@ Bug Fixes
 - Bug in ``read_msgpack`` where input type is not always checked (:issue:`10369`)
 
 - Bug in `pandas.read_csv` with ``index_col=False`` or with ``index_col=['a', 'b']``  (:issue:`10413`, :issue:`10467`)
+
+- Bug in `Series.from_csv` with ``header`` kwarg not setting the ``Series.name`` or the ``Series.index.name`` (:issue:`10483`)

pandas/core/series.py

@@ -2330,7 +2330,9 @@ def from_csv(cls, path, sep=',', parse_dates=True, header=None,
                                 encoding=encoding,
                                 infer_datetime_format=infer_datetime_format)
         result = df.icol(0)
-        result.index.name = result.name = None
+        if header is None:
+            result.index.name = result.name = None
+
         return result
 
     def to_csv(self, path, index=True, sep=",", na_rep='',

pandas/tests/test_series.py

@@ -4979,6 +4979,11 @@ def test_from_csv(self):
             self.assertTrue(ts.name is None)
             self.assertTrue(ts.index.name is None)
 
+            # GH10483
+            self.ts.to_csv(path, header=True)
+            ts_h = Series.from_csv(path, header=0)
+            self.assertTrue(ts_h.name == 'ts')
+
             self.series.to_csv(path)
             series = Series.from_csv(path)
             self.assertIsNone(series.name)
@@ -4987,6 +4992,10 @@ def test_from_csv(self):
             self.assertTrue(series.name is None)
             self.assertTrue(series.index.name is None)
 
+            self.series.to_csv(path, header=True)
+            series_h = Series.from_csv(path, header=0)
+            self.assertTrue(series_h.name == 'series')
+
             outfile = open(path, 'w')
             outfile.write('1998-01-01|1.0\n1999-01-01|2.0')
             outfile.close()