diff --git a/wo/cli/plugins/debug.py b/wo/cli/plugins/debug.py
index 1cb171e..ed38c5d 100644
--- a/wo/cli/plugins/debug.py
+++ b/wo/cli/plugins/debug.py
@@ -14,7 +14,7 @@ from wo.core.fileutils import WOFileUtils
 from wo.core.logging import Log
 from wo.core.mysql import WOMysql
 from wo.core.services import WOService
-from wo.core.shellexec import WOShellExec
+from wo.core.shellexec import WOShellExec, CommandExecutionError
 from wo.core.variables import WOVar
 
 
@@ -703,8 +703,7 @@ class WODebugController(CementBaseController):
                                                     "-l | sed '/WordOps "
                                                     "start MySQL slow "
                                                     "log/,+2d'"
-                                                    "| crontab -\""
-                                                    .format(cron_time)):
+                                                    "| crontab -\""):
                             Log.error(self, "failed to remove crontab entry")
             except CommandExecutionError as e:
                 Log.debug(self, str(e))
diff --git a/wo/cli/plugins/site.py b/wo/cli/plugins/site.py
index 344d0ea..0319a6d 100644
--- a/wo/cli/plugins/site.py
+++ b/wo/cli/plugins/site.py
@@ -227,8 +227,7 @@ class WOSiteController(CementBaseController):
             Log.info(self, Log.ENDC + text)
             f.close()
         else:
-            Log.error(self, "nginx configuration file does not exists"
-                      .format(wo_domain))
+            Log.error(self, "nginx configuration file does not exists")
 
     @expose(help="Change directory to site webroot")
     def cd(self):
diff --git a/wo/core/acme.py b/wo/core/acme.py
index 444041e..eccaaf5 100644
--- a/wo/core/acme.py
+++ b/wo/core/acme.py
@@ -148,9 +148,8 @@ class WOAcme:
                     self, "You have to set the "
                     "proper DNS record for your domain", False)
                 return False
-        else:
-            Log.debug(self, "DNS record are properly set")
-            return True
+        Log.debug(self, "DNS record are properly set")
+        return True
 
     def cert_check(self, wo_domain_name):
         """Check certificate existance with acme.sh and return Boolean"""
diff --git a/wo/core/domainvalidate.py b/wo/core/domainvalidate.py
index 0db491d..e84a26b 100644
--- a/wo/core/domainvalidate.py
+++ b/wo/core/domainvalidate.py
@@ -2,7 +2,7 @@
 import os
 
 
-class WODomain():
+class WODomain:
     """WordOps domain validation utilities"""
 
     def validate(self, url):
@@ -24,7 +24,6 @@ class WODomain():
             return final_domain
         return domain_name
 
-
     def getlevel(self, domain):
         """
             Returns the domain type : domain, subdomain and the root domain