move exchange_helpers to data module

freqtrade/data/convert.py

@@ -1,5 +1,5 @@
 """
-Functions to analyze ticker data with indicators and produce buy and sell signals
+Functions to convert data from one format to another
 """
 import logging
 import pandas as pd
@@ -10,7 +10,7 @@ logger = logging.getLogger(__name__)
 
 def parse_ticker_dataframe(ticker: list) -> DataFrame:
     """
-    Analyses the trend for the given ticker history
+    Converts a ticker-list (format ccxt.fetch_ohlcv) to a Dataframe
     :param ticker: ticker list, as returned by exchange.async_get_candle_history
     :return: DataFrame
     """

freqtrade/exchange/__init__.py

@@ -14,7 +14,7 @@ import ccxt.async_support as ccxt_async
 from pandas import DataFrame
 
 from freqtrade import constants, OperationalException, DependencyException, TemporaryError
-from freqtrade.exchange.exchange_helpers import parse_ticker_dataframe
+from freqtrade.data.convert import parse_ticker_dataframe
 
 logger = logging.getLogger(__name__)
 

freqtrade/tests/data/test_convert.py

@@ -1,7 +1,7 @@
 # pragma pylint: disable=missing-docstring, C0103
 import logging
 
-from freqtrade.exchange.exchange_helpers import parse_ticker_dataframe
+from freqtrade.data.convert import parse_ticker_dataframe
 from freqtrade.tests.conftest import log_has