Make pylint more strict (#1626)

* make pylint more strict

* cleanup in progress

* done cleaning up

* no opendbc

common/params.py

@@ -30,6 +30,7 @@ import threading
 from enum import Enum
 from common.basedir import PARAMS
 
+
 def mkdirs_exists_ok(path):
   try:
     os.makedirs(path)
@@ -143,6 +144,10 @@ class DBAccessor():
 
   def get(self, key):
     self._check_entered()
+
+    if self._vals is None:
+      return None
+
     try:
       return self._vals[key]
     except KeyError:
@@ -195,7 +200,7 @@ class DBReader(DBAccessor):
     finally:
       lock.release()
 
-  def __exit__(self, type, value, traceback):
+  def __exit__(self, exc_type, exc_value, traceback):
     pass
 
 
@@ -221,14 +226,14 @@ class DBWriter(DBAccessor):
       os.chmod(self._path, 0o777)
       self._lock = self._get_lock(True)
       self._vals = self._read_values_locked()
-    except:
+    except Exception:
       os.umask(self._prev_umask)
       self._prev_umask = None
       raise
 
     return self
 
-  def __exit__(self, type, value, traceback):
+  def __exit__(self, exc_type, exc_value, traceback):
     self._check_entered()
 
     try:
@@ -302,12 +307,13 @@ def read_db(params_path, key):
   except IOError:
     return None
 
+
 def write_db(params_path, key, value):
   if isinstance(value, str):
     value = value.encode('utf8')
 
   prev_umask = os.umask(0)
-  lock = FileLock(params_path+"/.lock", True)
+  lock = FileLock(params_path + "/.lock", True)
   lock.acquire()
 
   try:
@@ -324,12 +330,13 @@ def write_db(params_path, key, value):
     os.umask(prev_umask)
     lock.release()
 
+
 class Params():
   def __init__(self, db=PARAMS):
     self.db = db
 
     # create the database if it doesn't exist...
-    if not os.path.exists(self.db+"/d"):
+    if not os.path.exists(self.db + "/d"):
       with self.transaction(write=True):
         pass