diff --git a/influxdb/_dataframe_client.py b/influxdb/_dataframe_client.py
index ac110a4a..b753bb33 100644
--- a/influxdb/_dataframe_client.py
+++ b/influxdb/_dataframe_client.py
@@ -302,17 +302,10 @@ def _convert_dataframe_to_lines(self,
tag_df = self._stringify_dataframe(
tag_df, numeric_precision, datatype='tag')
- # prepend tag keys
- tag_df = tag_df.apply(
- lambda s: s.apply(
- lambda v, l: l + '=' + v if v else None, l=s.name))
-
- # join tags, but leave out None values
+ # join preprendded tags, leaving None values out
tags = tag_df.apply(
- lambda r: ','.join(r.dropna()), axis=1)
-
- # prepend comma
- tags = tags.apply(lambda v: ',' + v if v else '')
+ lambda s: [',' + s.name + '=' + v if v else '' for v in s])
+ tags = tags.sum(axis=1)
del tag_df
else:
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