diff --git a/extras/startup-scripts/patroni b/extras/startup-scripts/patroni
index d48dff6f..8d90ea1c 100644
--- a/extras/startup-scripts/patroni
+++ b/extras/startup-scripts/patroni
@@ -1,144 +1,144 @@
-#!/bin/sh
-#
-### BEGIN INIT INFO
-# Provides:          patroni
-# Required-Start:    $remote_fs $syslog
-# Required-Stop:     $remote_fs $syslog
-# Default-Start:     2 3 4 5
-# Default-Stop:      0 1 6
-# Short-Description: Patroni init script
-# Description:       Runners to orchestrate a high-availability PostgreSQL
-### END INIT INFO
-
-### BEGIN USER CONFIGURATION
-
-CONF="/etc/patroni/postgres.yml"
-LOGFILE="/var/log/patroni.log"
-USER="postgres"
-GROUP="postgres"
-
-NAME=patroni
-PATRONI="/opt/patroni/$NAME.py"
-PIDFILE="/var/run/$NAME.pid"
-
-# Set this parameter, if you have several Postgres versions installed
-# POSTGRES_VERSION="9.4"
-POSTGRES_VERSION=""
-
-### END USER CONFIGURATION
-
-. /lib/lsb/init-functions
-
-# Loading this library for get_versions() function
-if test ! -e /usr/share/postgresql-common/init.d-functions; then
-  log_failure_msg "Probably postgresql-common does not installed."
-  exit 1
-else
-  . /usr/share/postgresql-common/init.d-functions
-fi
-
-# Is there Patroni executable?
-if test ! -e $PATRONI; then
-  log_failure_msg "Patroni executable $PATRONI does not exist."
-  exit 1
-fi
-
-# Is there Patroni configuration file?
-if test ! -e $CONF; then
-  log_failure_msg "Patroni configuration file $CONF does not exist."
-  exit 1
-fi
-
-# Create logfile if doesn't exist
-if test ! -e $LOGFILE; then
-  log_action_msg "Creating logfile for Patroni..."
-  touch $LOGFILE
-  chown $USER:$GROUP $LOGFILE
-fi
-
-prepare_pgpath() {
-  if [ "$POSTGRES_VERSION" != "" ]; then
-    if [ -x /usr/lib/postgresql/$POSTGRES_VERSION/bin/pg_ctl ]; then
-      PGPATH="/usr/lib/postgresql/$POSTGRES_VERSION/bin"
-    else
-      log_failure_msg "Postgres version incorrect, check POSTGRES_VERSION variable."
-      exit 0
-    fi
-  else
-    get_versions
-    if echo $versions | grep -q -e "\s"; then
-      log_warning_msg "You have several Postgres versions installed. Please, use POSTGRES_VERSION to define correct environment."
-    else
-      versions=`echo $versions | sed -e 's/^[ \t]*//'`
-      PGPATH="/usr/lib/postgresql/$versions/bin"
-    fi
-  fi
-}
-
-get_pid() {
-  if test -e $PIDFILE; then
-    PID=`cat $PIDFILE`
-    CHILDPID=`ps --ppid $PID -o %p --no-headers`
-  else
-    log_failure_msg "Could not find PID file. Patroni probably down."
-    exit 1
-  fi
-}
-
-
-case "$1" in
-  start)
-    prepare_pgpath
-    PGPATH=$PATH:$PGPATH
-    log_success_msg "Starting Patroni\n"
-    exec start-stop-daemon --start --quiet \
-        --background \
-        --pidfile $PIDFILE --make-pidfile \
-        --chuid $USER:$GROUP \
-        --chdir `eval echo ~$USER` \
-        --exec $PATRONI \
-        --startas /bin/sh -- \
-        -c "/usr/bin/env PATH=$PGPATH /usr/bin/python $PATRONI $CONF >> $LOGFILE 2>&1"
-    ;;
-
-  stop)
-    log_success_msg "Stopping Patroni"
-    get_pid
-    start-stop-daemon --stop --pid $CHILDPID
-    start-stop-daemon --stop --pidfile $PIDFILE --remove-pidfile --quiet
-    ;;
-
-  reload)
-    log_success_msg "Reloading Patroni configuration"
-    get_pid
-    kill -HUP $CHILDPID
-    ;;
-
-  status)
-    get_pid
-    if start-stop-daemon -T --pid $CHILDPID; then
-      log_success_msg "Patroni is running\n"
-      exit 0
-    else
-      log_warning_msg "Patroni in not running\n"
-    fi
-    ;;
-
-  restart)
-    $0 stop
-    $0 start
-    ;;
-
-  *)
-    echo "Usage: /etc/init.d/$NAME {start|stop|restart|reload|status}"
-    exit 1
-    ;;
-esac
-
-if [ $? -eq 0 ]; then
-        echo .
-        exit 0
-else
-        echo " failed"
-        exit 1
-fi
+#!/bin/sh
+#
+### BEGIN INIT INFO
+# Provides:          patroni
+# Required-Start:    $remote_fs $syslog
+# Required-Stop:     $remote_fs $syslog
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: Patroni init script
+# Description:       Runners to orchestrate a high-availability PostgreSQL
+### END INIT INFO
+
+### BEGIN USER CONFIGURATION
+
+CONF="/etc/patroni/postgres.yml"
+LOGFILE="/var/log/patroni.log"
+USER="postgres"
+GROUP="postgres"
+
+NAME=patroni
+PATRONI="/opt/patroni/$NAME.py"
+PIDFILE="/var/run/$NAME.pid"
+
+# Set this parameter, if you have several Postgres versions installed
+# POSTGRES_VERSION="9.4"
+POSTGRES_VERSION=""
+
+### END USER CONFIGURATION
+
+. /lib/lsb/init-functions
+
+# Loading this library for get_versions() function
+if test ! -e /usr/share/postgresql-common/init.d-functions; then
+  log_failure_msg "Probably postgresql-common does not installed."
+  exit 1
+else
+  . /usr/share/postgresql-common/init.d-functions
+fi
+
+# Is there Patroni executable?
+if test ! -e $PATRONI; then
+  log_failure_msg "Patroni executable $PATRONI does not exist."
+  exit 1
+fi
+
+# Is there Patroni configuration file?
+if test ! -e $CONF; then
+  log_failure_msg "Patroni configuration file $CONF does not exist."
+  exit 1
+fi
+
+# Create logfile if doesn't exist
+if test ! -e $LOGFILE; then
+  log_action_msg "Creating logfile for Patroni..."
+  touch $LOGFILE
+  chown $USER:$GROUP $LOGFILE
+fi
+
+prepare_pgpath() {
+  if [ "$POSTGRES_VERSION" != "" ]; then
+    if [ -x /usr/lib/postgresql/$POSTGRES_VERSION/bin/pg_ctl ]; then
+      PGPATH="/usr/lib/postgresql/$POSTGRES_VERSION/bin"
+    else
+      log_failure_msg "Postgres version incorrect, check POSTGRES_VERSION variable."
+      exit 0
+    fi
+  else
+    get_versions
+    if echo $versions | grep -q -e "\s"; then
+      log_warning_msg "You have several Postgres versions installed. Please, use POSTGRES_VERSION to define correct environment."
+    else
+      versions=`echo $versions | sed -e 's/^[ \t]*//'`
+      PGPATH="/usr/lib/postgresql/$versions/bin"
+    fi
+  fi
+}
+
+get_pid() {
+  if test -e $PIDFILE; then
+    PID=`cat $PIDFILE`
+    CHILDPID=`ps --ppid $PID -o %p --no-headers`
+  else
+    log_failure_msg "Could not find PID file. Patroni probably down."
+    exit 1
+  fi
+}
+
+
+case "$1" in
+  start)
+    prepare_pgpath
+    PGPATH=$PATH:$PGPATH
+    log_success_msg "Starting Patroni\n"
+    exec start-stop-daemon --start --quiet \
+        --background \
+        --pidfile $PIDFILE --make-pidfile \
+        --chuid $USER:$GROUP \
+        --chdir `eval echo ~$USER` \
+        --exec $PATRONI \
+        --startas /bin/sh -- \
+        -c "/usr/bin/env PATH=$PGPATH /usr/bin/python $PATRONI $CONF >> $LOGFILE 2>&1"
+    ;;
+
+  stop)
+    log_success_msg "Stopping Patroni"
+    get_pid
+    start-stop-daemon --stop --pid $CHILDPID
+    start-stop-daemon --stop --pidfile $PIDFILE --remove-pidfile --quiet
+    ;;
+
+  reload)
+    log_success_msg "Reloading Patroni configuration"
+    get_pid
+    kill -HUP $CHILDPID
+    ;;
+
+  status)
+    get_pid
+    if start-stop-daemon -T --pid $CHILDPID; then
+      log_success_msg "Patroni is running\n"
+      exit 0
+    else
+      log_warning_msg "Patroni in not running\n"
+    fi
+    ;;
+
+  restart)
+    $0 stop
+    $0 start
+    ;;
+
+  *)
+    echo "Usage: /etc/init.d/$NAME {start|stop|restart|reload|status}"
+    exit 1
+    ;;
+esac
+
+if [ $? -eq 0 ]; then
+        echo .
+        exit 0
+else
+        echo " failed"
+        exit 1
+fi
diff --git a/features/environment.py b/features/environment.py
index 3f622e49..d82a95ff 100644
--- a/features/environment.py
+++ b/features/environment.py
@@ -228,7 +228,7 @@ class PatroniController(AbstractController):
             if not os.path.exists(pidfile):
                 return None
             return int(open(pidfile).readline().strip())
-        except:
+        except Exception:
             return None
 
     def database_is_running(self):
diff --git a/patroni/async_executor.py b/patroni/async_executor.py
index dc9d1896..f1de6490 100644
--- a/patroni/async_executor.py
+++ b/patroni/async_executor.py
@@ -85,7 +85,7 @@ class AsyncExecutor(object):
             # if the func returned something (not None) - wake up main HA loop
             wakeup = func(*args) if args else func()
             return wakeup
-        except:
+        except Exception:
             logger.exception('Exception during execution of long running task %s', self.scheduled_action)
         finally:
             with self:
diff --git a/patroni/dcs/__init__.py b/patroni/dcs/__init__.py
index 7afbc995..fb97eedc 100644
--- a/patroni/dcs/__init__.py
+++ b/patroni/dcs/__init__.py
@@ -424,7 +424,7 @@ class AbstractDCS(object):
         with self._cluster_thread_lock:
             try:
                 self._load_cluster()
-            except:
+            except Exception:
                 self._cluster = None
                 raise
             return self._cluster
diff --git a/patroni/dcs/consul.py b/patroni/dcs/consul.py
index 9cca6041..56cf63de 100644
--- a/patroni/dcs/consul.py
+++ b/patroni/dcs/consul.py
@@ -262,7 +262,7 @@ class Consul(AbstractDCS):
             self._cluster = Cluster(initialize, config, leader, last_leader_operation, members, failover, sync)
         except NotFound:
             self._cluster = Cluster(None, None, None, None, [], None, None)
-        except:
+        except Exception:
             logger.exception('get_cluster')
             raise ConsulError('Consul is not responding properly')
 
diff --git a/patroni/dcs/zookeeper.py b/patroni/dcs/zookeeper.py
index 82cdff4b..43bcb42b 100644
--- a/patroni/dcs/zookeeper.py
+++ b/patroni/dcs/zookeeper.py
@@ -206,7 +206,7 @@ class ZooKeeper(AbstractDCS):
         try:
             self._client.retry(self._client.create, path, value.encode('utf-8'), **kwargs)
             return True
-        except:
+        except Exception:
             return False
 
     def attempt_to_acquire_leader(self, permanent=False):
@@ -221,7 +221,7 @@ class ZooKeeper(AbstractDCS):
             return True
         except NoNodeError:
             return value == '' or (index is None and self._create(self.failover_path, value))
-        except:
+        except Exception:
             logging.exception('set_failover_value')
             return False
 
@@ -248,7 +248,7 @@ class ZooKeeper(AbstractDCS):
                 self._client.delete_async(self.member_path).get(timeout=1)
             except NoNodeError:
                 pass
-            except:
+            except Exception:
                 return False
             member = None
 
@@ -268,7 +268,7 @@ class ZooKeeper(AbstractDCS):
             self._client.set_async(self.member_path, data).get(timeout=1)
             self._my_member_data = data
             return True
-        except:
+        except Exception:
             logger.exception('touch_member')
 
         return False
@@ -285,9 +285,9 @@ class ZooKeeper(AbstractDCS):
             try:
                 self._client.create_async(self.leader_optime_path, last_operation, makepath=True).get(timeout=1)
                 return True
-            except:
+            except Exception:
                 logger.exception('Failed to create %s', self.leader_optime_path)
-        except:
+        except Exception:
             logger.exception('Failed to update %s', self.leader_optime_path)
         return False
 
@@ -307,7 +307,7 @@ class ZooKeeper(AbstractDCS):
     def cancel_initialization(self):
         try:
             self._client.retry(self._cancel_initialization)
-        except:
+        except Exception:
             logger.exception("Unable to delete initialize key")
 
     def delete_cluster(self):
@@ -322,7 +322,7 @@ class ZooKeeper(AbstractDCS):
             return True
         except NoNodeError:
             return value == '' or (index is None and self._create(self.sync_path, value))
-        except:
+        except Exception:
             logging.exception('set_sync_state_value')
             return False
 
diff --git a/patroni/ha.py b/patroni/ha.py
index 730bec56..9a50dfea 100644
--- a/patroni/ha.py
+++ b/patroni/ha.py
@@ -91,7 +91,7 @@ class Ha(object):
             if write_leader_optime:
                 try:
                     self.dcs.write_leader_optime(self.state_handler.last_operation())
-                except:
+                except Exception:
                     pass
         return ret
 
@@ -124,7 +124,7 @@ class Ha(object):
             if not self._async_executor.busy and data['state'] in ['running', 'restarting', 'starting']:
                 try:
                     data['xlog_location'] = self.state_handler.wal_position(retry=False)
-                except:
+                except Exception:
                     pass
             if self.patroni.scheduled_restart:
                 scheduled_restart_data = self.patroni.scheduled_restart.copy()
diff --git a/patroni/utils.py b/patroni/utils.py
index 3ebd1f7a..bdf663ab 100644
--- a/patroni/utils.py
+++ b/patroni/utils.py
@@ -95,17 +95,17 @@ def strtol(value, strict=True):
     True
     """
     value = str(value).strip()
-    l = len(value)
+    ln = len(value)
     i = 0
     # skip sign:
-    if i < l and value[i] in ('-', '+'):
+    if i < ln and value[i] in ('-', '+'):
         i += 1
 
     # we always expect to get digit in the beginning
-    if i < l and value[i].isdigit():
+    if i < ln and value[i].isdigit():
         if value[i] == '0':
             i += 1
-            if i < l and value[i] in ('x', 'X'):  # '0' followed by 'x': HEX
+            if i < ln and value[i] in ('x', 'X'):  # '0' followed by 'x': HEX
                 base = 16
                 i += 1
             else:  # just starts with '0': OCT
@@ -114,7 +114,7 @@ def strtol(value, strict=True):
             base = 10
 
         ret = None
-        while i <= l:
+        while i <= ln:
             try:  # try to find maximally long number
                 i += 1  # by giving to `int` longer and longer strings
                 ret = int(value[:i], base)
diff --git a/setup.py b/setup.py
index a610b8fb..424d4d90 100644
--- a/setup.py
+++ b/setup.py
@@ -87,7 +87,7 @@ class PyTest(TestCommand):
     def run_tests(self):
         try:
             import pytest
-        except:
+        except Exception:
             raise RuntimeError('py.test is not installed, run: pip install pytest')
         params = {'args': self.test_args}
         if self.cov:
diff --git a/tests/test_ha.py b/tests/test_ha.py
index fa3d0cec..3f4a40a4 100644
--- a/tests/test_ha.py
+++ b/tests/test_ha.py
@@ -35,7 +35,7 @@ def get_cluster_not_initialized_without_leader():
 def get_cluster_initialized_without_leader(leader=False, failover=None, sync=None):
     m1 = Member(0, 'leader', 28, {'conn_url': 'postgres://replicator:rep-pass@127.0.0.1:5435/postgres',
                                   'api_url': 'http://127.0.0.1:8008/patroni', 'xlog_location': 4})
-    l = Leader(0, 0, m1) if leader else None
+    leader = Leader(0, 0, m1) if leader else None
     m2 = Member(0, 'other', 28, {'conn_url': 'postgres://replicator:rep-pass@127.0.0.1:5436/postgres',
                                  'api_url': 'http://127.0.0.1:8011/patroni',
                                  'state': 'running',
@@ -43,7 +43,7 @@ def get_cluster_initialized_without_leader(leader=False, failover=None, sync=Non
                                  'scheduled_restart': {'schedule': "2100-01-01 10:53:07.560445+00:00",
                                                        'postgres_version': '99.0.0'}})
     syncstate = SyncState(0 if sync else None, sync and sync[0], sync and sync[1])
-    return get_cluster(True, l, [m1, m2], failover, syncstate)
+    return get_cluster(True, leader, [m1, m2], failover, syncstate)
 
 
 def get_cluster_initialized_with_leader(failover=None, sync=None):
@@ -51,8 +51,8 @@ def get_cluster_initialized_with_leader(failover=None, sync=None):
 
 
 def get_cluster_initialized_with_only_leader(failover=None):
-    l = get_cluster_initialized_without_leader(leader=True, failover=failover).leader
-    return get_cluster(True, l, [l], failover, None)
+    leader = get_cluster_initialized_without_leader(leader=True, failover=failover).leader
+    return get_cluster(True, leader, [leader], failover, None)
 
 
 def get_node_status(reachable=True, in_recovery=True, wal_position=10, nofailover=False, watchdog_failed=False):