diff --git a/freqtrade/pairlist/PrecisionFilter.py b/freqtrade/pairlist/PrecisionFilter.py
index 85fa592f8..6bd9c594e 100644
--- a/freqtrade/pairlist/PrecisionFilter.py
+++ b/freqtrade/pairlist/PrecisionFilter.py
@@ -1,9 +1,13 @@
+"""
+Precision pair list filter
+"""
 import logging
 from copy import deepcopy
 from typing import Any, Dict, List
 
 from freqtrade.pairlist.IPairList import IPairList
 
+
 logger = logging.getLogger(__name__)
 
 
@@ -63,9 +67,8 @@ class PrecisionFilter(IPairList):
         """
         # Copy list since we're modifying this list
         for p in deepcopy(pairlist):
-            ticker = tickers[p]
             # Filter out assets which would not allow setting a stoploss
-            if not self._validate_precision_filter(ticker, self._stoploss):
+            if not self._validate_precision_filter(tickers[p], self._stoploss):
                 pairlist.remove(p)
 
         return pairlist
diff --git a/freqtrade/pairlist/PriceFilter.py b/freqtrade/pairlist/PriceFilter.py
index 166515148..167717656 100644
--- a/freqtrade/pairlist/PriceFilter.py
+++ b/freqtrade/pairlist/PriceFilter.py
@@ -1,9 +1,13 @@
+"""
+Price pair list filter
+"""
 import logging
 from copy import deepcopy
 from typing import Any, Dict, List
 
 from freqtrade.pairlist.IPairList import IPairList
 
+
 logger = logging.getLogger(__name__)
 
 
@@ -61,9 +65,8 @@ class PriceFilter(IPairList):
         if self._low_price_ratio:
             # Copy list since we're modifying this list
             for p in deepcopy(pairlist):
-                ticker = tickers[p]
                 # Filter out assets which would not allow setting a stoploss
-                if not self._validate_ticker_lowprice(ticker):
+                if not self._validate_ticker_lowprice(tickers[p]):
                     pairlist.remove(p)
 
         return pairlist
diff --git a/freqtrade/pairlist/SpreadFilter.py b/freqtrade/pairlist/SpreadFilter.py
index 5b886135f..88e143a50 100644
--- a/freqtrade/pairlist/SpreadFilter.py
+++ b/freqtrade/pairlist/SpreadFilter.py
@@ -1,9 +1,13 @@
+"""
+Spread pair list filter
+"""
 import logging
 from copy import deepcopy
 from typing import Dict, List
 
 from freqtrade.pairlist.IPairList import IPairList
 
+
 logger = logging.getLogger(__name__)
 
 
diff --git a/freqtrade/pairlist/StaticPairList.py b/freqtrade/pairlist/StaticPairList.py
index 0050fbd5c..07e559168 100644
--- a/freqtrade/pairlist/StaticPairList.py
+++ b/freqtrade/pairlist/StaticPairList.py
@@ -1,14 +1,14 @@
 """
-Static List provider
+Static Pair List provider
 
-Provides lists as configured in config.json
-
- """
+Provides pair white list as it configured in config
+"""
 import logging
 from typing import Dict, List
 
 from freqtrade.pairlist.IPairList import IPairList
 
+
 logger = logging.getLogger(__name__)
 
 
diff --git a/freqtrade/pairlist/VolumePairList.py b/freqtrade/pairlist/VolumePairList.py
index 46ff4b9c8..e20fb3577 100644
--- a/freqtrade/pairlist/VolumePairList.py
+++ b/freqtrade/pairlist/VolumePairList.py
@@ -1,9 +1,8 @@
 """
 Volume PairList provider
 
-Provides lists as configured in config.json
-
- """
+Provides dynamic pair list based on trade volumes
+"""
 import logging
 from datetime import datetime
 from typing import Any, Dict, List
@@ -11,8 +10,10 @@ from typing import Any, Dict, List
 from freqtrade.exceptions import OperationalException
 from freqtrade.pairlist.IPairList import IPairList
 
+
 logger = logging.getLogger(__name__)
 
+
 SORT_VALUES = ['askVolume', 'bidVolume', 'quoteVolume']
 
 
@@ -115,7 +116,7 @@ class VolumePairList(IPairList):
         # Validate whitelist to only have active market pairs
         pairs = self._whitelist_for_active_markets([s['symbol'] for s in sorted_tickers])
         pairs = self._verify_blacklist(pairs, aswarning=False)
-        # Limit to X number of pairs
+        # Limit pairlist to the requested number of pairs
         pairs = pairs[:self._number_pairs]
 
         return pairs