Fix: Fixed minor bug and improved coding style.

(Redmine issue: #3443)

lib/mentat/module/precache.py

@@ -87,10 +87,7 @@ __credits__ = "Pavel Kácha <pavel.kacha@cesnet.cz>, Andrea Kropáčová <andrea
 
 
 import os
-import sys
-import time
 import datetime
-import traceback
 
 #
 # Custom libraries
@@ -133,7 +130,7 @@ class MentatPrecacheScript(mentat.script.fetcher.FetcherScript):
 
         super().__init__(
 
-            description = 'mentat-precache.py - Mentat system database pre-caching script',
+            description = 'mentat-precache.py - Mentat database pre-caching script',
 
             #
             # Configure required script paths.
@@ -230,7 +227,7 @@ class MentatPrecacheScript(mentat.script.fetcher.FetcherScript):
         can be then used for various use cases like generating value selection
         widgets for user interface etc.
         """
-        result = {'messages': {'info': [], 'warning': {}}, 'itemsets': {}}
+        result = {'messages': {'info': [], 'warning': []}, 'itemsets': {}}
 
         for iset in self.c(self.CONFIG_ITEMSETS):
 
@@ -264,7 +261,8 @@ class MentatPrecacheScript(mentat.script.fetcher.FetcherScript):
 
         self.logger.info("Status of cache directory '%s'", self.c(self.CONFIG_CACHE_DIR))
         for cache in sorted(result.keys()):
-            self.logger.info("Cache '%s', %d item(s), age: %s, modified on %s",
+            self.logger.info(
+                "Cache '%s', %d item(s), age: %s, modified on %s",
                 result[cache]['file'],
                 len(result[cache]['data']),
                 str(datetime.datetime.utcnow() - result[cache]['mtime']),