Revised the code as suggested by PyCharm.

mia_core/digest_auth.py

@@ -56,10 +56,10 @@ class AccountBackend:
         """Returns the user by her log in user name.
 
         Args:
-            username (str): The log in user name.
+            username: The log in user name.
 
         Return:
-            User: The user, or None if the user does not eixst.
+            The user, or None if the user does not exist.
         """
         return User.objects.filter(login_id=username).first()
 
@@ -133,7 +133,9 @@ def _get_host(ip: str) -> Optional[str]:
     """
     try:
         return socket.gethostbyaddr(ip)[0]
-    except Exception:
+    except socket.herror:
+        return None
+    except socket.gaierror:
         return None
 
 

mia_core/forms.py

@@ -146,7 +146,7 @@ class UserForm(forms.Form):
         raise error
 
     def _validate_passwords_equal(self) -> None:
-        """Validates whether the two passwords are equa.
+        """Validates whether the two passwords are equal.
 
         Raises:
             forms.ValidationError: When the validation fails.

mia_core/period.py

@@ -20,8 +20,7 @@
 """
 import datetime
 import re
-from datetime import date
-from typing import Optional, List, Any, Union
+from typing import Optional, List
 
 from django.core.serializers.json import DjangoJSONEncoder
 from django.template import defaultfilters
@@ -461,7 +460,7 @@ class Period:
                 self.start = datetime.date(year, month, 1)
                 self.end = self._month_last_day(timezone.localdate())
                 self.description = gettext("Since %s")\
-                                   % self._month_text(year, month)
+                    % self._month_text(year, month)
                 self.prep_desc = self.description
                 return
             # Until a specific month
@@ -474,7 +473,7 @@ class Period:
                 self.start = Period.Parser.VERY_START
                 self.end = self._month_last_day(until_month)
                 self.description = gettext("Until %s")\
-                                   % self._month_text(year, month)
+                    % self._month_text(year, month)
                 self.prep_desc = self.description
                 return
             # A specific year
@@ -495,7 +494,7 @@ class Period:
                 self.end = datetime.date(year, 12, 31)
                 self.start = Period.Parser.VERY_START
                 self.description = gettext("Until %s")\
-                                   % self._year_text(year)
+                    % self._year_text(year)
                 self.prep_desc = self.description
                 return
             # All time
@@ -574,7 +573,7 @@ class Period:
                     int(m.group(3)))
                 self.start = Period.Parser.VERY_START
                 self.description = gettext("Until %s")\
-                                   % self._date_text(self.end)
+                    % self._date_text(self.end)
                 self.prep_desc = self.description
                 return
             # Wrong period format

mia_core/templatetags/mia_core.py

@@ -211,4 +211,4 @@ def is_in_section(request: HttpRequest, section_name: str) -> bool:
         return False
     view_name = request.resolver_match.view_name
     return view_name == section_name\
-           or view_name.startswith(section_name + ".")
+        or view_name.startswith(section_name + ".")