diff --git a/influxdb/_dataframe_client.py b/influxdb/_dataframe_client.py
index 5f81e4c8..fb7b4da5 100644
--- a/influxdb/_dataframe_client.py
+++ b/influxdb/_dataframe_client.py
@@ -44,8 +44,8 @@ def write_points(self,
dataframe,
measurement,
tags=None,
- tag_columns=[],
- field_columns=[],
+ tag_columns=None,
+ field_columns=None,
time_precision=None,
database=None,
retention_policy=None,
@@ -72,6 +72,10 @@ def write_points(self,
figures for float and all significant figures for int datatypes.
"""
+ if tag_columns is None:
+ tag_columns = []
+ if field_columns is None:
+ field_columns = []
if batch_size:
number_batches = int(math.ceil(len(dataframe) / float(batch_size)))
for batch in range(number_batches):
@@ -166,8 +170,8 @@ def _convert_dataframe_to_json(self,
dataframe,
measurement,
tags=None,
- tag_columns=[],
- field_columns=[],
+ tag_columns=None,
+ field_columns=None,
time_precision=None):
if not isinstance(dataframe, pd.DataFrame):
@@ -221,9 +225,9 @@ def _convert_dataframe_to_json(self,
def _convert_dataframe_to_lines(self,
dataframe,
measurement,
- field_columns=[],
- tag_columns=[],
- global_tags={},
+ field_columns=None,
+ tag_columns=None,
+ global_tags=None,
time_precision=None,
numeric_precision=None):
@@ -242,6 +246,8 @@ def _convert_dataframe_to_lines(self,
field_columns = []
if tag_columns is None:
tag_columns = []
+ if global_tags is None:
+ global_tags = {}
# Make sure field_columns and tag_columns are lists
field_columns = list(field_columns) if list(field_columns) else []
diff --git a/influxdb/client.py b/influxdb/client.py
index b9faa4f0..1a0a4821 100644
--- a/influxdb/client.py
+++ b/influxdb/client.py
@@ -131,8 +131,8 @@ def _port(self):
def _get_port(self):
return self.__port
- @staticmethod
- def from_DSN(dsn, **kwargs):
+ @classmethod
+ def from_DSN(cls, dsn, **kwargs):
"""Return an instance of :class:`~.InfluxDBClient` from the provided
data source name. Supported schemes are "influxdb", "https+influxdb"
and "udp+influxdb". Parameters for the :class:`~.InfluxDBClient`
@@ -169,7 +169,7 @@ def from_DSN(dsn, **kwargs):
init_args['port'] = port
init_args.update(kwargs)
- return InfluxDBClient(**init_args)
+ return cls(**init_args)
def switch_database(self, database):
"""Change the client's database.
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