remove leading space

Author: charlesdong1991

pandas/io/formats/format.py

@@ -252,8 +252,13 @@ def _get_formatted_index(self):
 
     def _get_formatted_values(self):
         values_to_format = self.tr_series._formatting_values()
-        return format_array(values_to_format, None,
-                            float_format=self.float_format, na_rep=self.na_rep)
+        if self.index:
+            return format_array(values_to_format, None,
+                                float_format=self.float_format, na_rep=self.na_rep)
+        else:
+            return format_array(values_to_format, None,
+                                float_format=self.float_format, na_rep=self.na_rep,
+                                leading_space=False)
 
     def to_string(self):
         series = self.tr_series

pandas/tests/io/formats/test_format.py

@@ -2729,3 +2729,13 @@ def test_format_percentiles():
         fmt.format_percentiles([2, 0.1, 0.5])
     with pytest.raises(ValueError, match=msg):
         fmt.format_percentiles([0.1, 0.5, 'a'])
+
+
+@pytest.mark.parametrize("input_array, expected", [
+    ("a", "a"),
+    (["a", "b"], "a\nb")
+])
+def test_format_remove_leading_space(input_array, expected):
+    # GH: 24980
+    s = pd.Series(input_array).to_string(index=False)
+    assert s == expected