use native python logger

scripts/convert_backtestdata.py

@@ -10,7 +10,7 @@ Optional Cli parameters
 --timerange: specify what timerange of data to use.
 -l / --live: Live, to download the latest ticker for the pair
 """
-
+import logging
 import sys
 from argparse import Namespace
 from os import path
@@ -22,13 +22,12 @@ import gzip
 
 from freqtrade.arguments import Arguments
 from freqtrade import misc
-from freqtrade.logger import Logger
 from pandas import DataFrame
 from freqtrade.constants import Constants
 
 import dateutil.parser
 
-logger = Logger(name="freqtrade").get_logger()
+logger = logging.getLogger('freqtrade')
 
 
 def load_old_file(filename) -> (List[Dict], bool):

scripts/plot_dataframe.py

@@ -11,7 +11,7 @@ Optional Cli parameters
 --timerange: specify what timerange of data to use.
 -l / --live: Live, to download the latest ticker for the pair
 """
-
+import logging
 import sys
 from argparse import Namespace
 
@@ -24,11 +24,10 @@ import plotly.graph_objs as go
 from freqtrade.arguments import Arguments
 from freqtrade.analyze import Analyze
 from freqtrade import exchange
-from freqtrade.logger import Logger
 import freqtrade.optimize as optimize
 
 
-logger = Logger(name="Graph dataframe").get_logger()
+logger = logging.getLogger('freqtrade')
 
 
 def plot_analyzed_dataframe(args: Namespace) -> None:

scripts/plot_profit.py

@@ -10,7 +10,7 @@ Optional Cli parameters
 -s / --strategy: strategy to use
 --timerange: specify what timerange of data to use.
 """
-
+import logging
 import sys
 import json
 from argparse import Namespace
@@ -24,14 +24,13 @@ import plotly.graph_objs as go
 from freqtrade.arguments import Arguments
 from freqtrade.configuration import Configuration
 from freqtrade.analyze import Analyze
-from freqtrade.logger import Logger
 from freqtrade.constants import Constants
 
 import freqtrade.optimize as optimize
 import freqtrade.misc as misc
 
 
-logger = Logger(name="Graph profits").get_logger()
+logger = logging.getLogger('freqtrade')
 
 
 # data:: [ pair,      profit-%,  enter,         exit,        time, duration]