diff --git a/freqtrade/tests/optimize/test_optimize.py b/freqtrade/tests/optimize/test_optimize.py
index 5ee928099..808e4aa70 100644
--- a/freqtrade/tests/optimize/test_optimize.py
+++ b/freqtrade/tests/optimize/test_optimize.py
@@ -202,12 +202,12 @@ def test_download_backtesting_testdata2(mocker):
 
 
 def test_load_tickerdata_file():
-    #7 does not exist in either format.
+    # 7 does not exist in either format.
     assert not load_tickerdata_file(None, 'BTC_UNITEST', 7)
-    #1 exists only as a .json
+    # 1 exists only as a .json
     tickerdata = load_tickerdata_file(None, 'BTC_UNITEST', 1)
     assert _BTC_UNITTEST_LENGTH == len(tickerdata)
-    #8 .json is empty and will fail if it's loaded. .json.gz is a copy of 1.json
+    # 8 .json is empty and will fail if it's loaded. .json.gz is a copy of 1.json
     tickerdata = load_tickerdata_file(None, 'BTC_UNITEST', 8)
     assert _BTC_UNITTEST_LENGTH == len(tickerdata)