diff --git a/drf_user/__init__.py b/drf_user/__init__.py
index e64bf3c..b4ce697 100644
--- a/drf_user/__init__.py
+++ b/drf_user/__init__.py
@@ -44,9 +44,7 @@ def update_user_settings() -> dict:
 
     Author: Himanshu Shankar (https://himanshus.com)
     """
-    custom_settings = getattr(settings, "USER_SETTINGS", None)
-
-    if custom_settings:
+    if custom_settings := getattr(settings, "USER_SETTINGS", None):
         if not isinstance(custom_settings, dict):
             raise TypeError("USER_SETTING must be a dict.")
 
diff --git a/drf_user/serializers.py b/drf_user/serializers.py
index 0a1825f..10d8acb 100644
--- a/drf_user/serializers.py
+++ b/drf_user/serializers.py
@@ -190,19 +190,17 @@ def validate(self, attrs: dict) -> dict:
         else:
             attrs["prop"] = EMAIL
 
-        user = self.get_user(attrs.get("prop"), attrs.get("destination"))
+        if user := self.get_user(attrs.get("prop"), attrs.get("destination")):
+            attrs["email"] = user.email
+            attrs["user"] = user
 
-        if not user:
+        else:
             if attrs["is_login"]:
                 raise NotFound(_("No user exists with provided details"))
             if "email" not in attrs.keys() and "verify_otp" not in attrs.keys():
                 raise serializers.ValidationError(
                     _("Email field is compulsory while verifying a non-existing user's OTP.")
                 )
-        else:
-            attrs["email"] = user.email
-            attrs["user"] = user
-
         return attrs
 
 
@@ -328,13 +326,11 @@ def validate(self, attrs: dict) -> dict:
         """
         validator = EmailValidator()
         validator(attrs.get("email"))
-        user = self.get_user(attrs.get("email"))
-
-        if not user:
+        if user := self.get_user(attrs.get("email")):
+            return attrs
+        else:
             raise NotFound(_("User with the provided email does not exist."))
 
-        return attrs
-
 
 class ImageSerializer(serializers.ModelSerializer):
     """This serializer is for Image Upload API.
diff --git a/drf_user/utils.py b/drf_user/utils.py
index 1292221..c2b57cd 100644
--- a/drf_user/utils.py
+++ b/drf_user/utils.py
@@ -40,8 +40,7 @@ def get_client_ip(request: HttpRequest) -> Optional[str]:
     -------
     ip: str or None
     """
-    x_forwarded_for = request.META.get("HTTP_X_FORWARDED_FOR")
-    if x_forwarded_for:
+    if x_forwarded_for := request.META.get("HTTP_X_FORWARDED_FOR"):
         return x_forwarded_for.split(",")[0]
     else:
         return request.META.get("REMOTE_ADDR")
@@ -251,7 +250,7 @@ def is_mobile_valid(mobile: str) -> bool:
     >>> print(is_mobile_valid('9999999999'))
     True
     """
-    match = re.match(r"^[6-9]\d{9}$", str(mobile))
+    match = re.match(r"^[6-9]\d{9}$", mobile)
     if match is None:
         raise ValidationError("Enter a valid mobile number.")
     return True