from django.contrib.auth import authenticate
from rest_framework import serializers


class AuthTokenSerializer(serializers.Serializer):
    username = serializers.CharField()
    password = serializers.CharField()

    def validate(self, attrs):
        username = attrs.get('username')
        password = attrs.get('password')

        if username and password:
            user = authenticate(username=username, password=password)

            if user:
                if not user.is_active:
                    raise serializers.ValidationError('User account is disabled.')
                attrs['user'] = user
                return attrs
            else:
                raise serializers.ValidationError('Unable to login with provided credentials.')
        else:
            raise serializers.ValidationError('Must include "username" and "password"')

from django.contrib.auth import authenticate
from django.utils.translation import ugettext_lazy as _

from rest_framework import serializers


class AuthTokenSerializer(serializers.Serializer):
    username = serializers.CharField()
    password = serializers.CharField()

    def validate(self, attrs):
        username = attrs.get('username')
        password = attrs.get('password')

        if username and password:
            user = authenticate(username=username, password=password)

            if user:
                if not user.is_active:
                    msg = _('User account is disabled.')
                    raise serializers.ValidationError()
                attrs['user'] = user
                return attrs
            else:
                msg = _('Unable to login with provided credentials.')
                raise serializers.ValidationError(msg)
        else:
            msg = _('Must include "username" and "password"')
            raise serializers.ValidationError(msg)

Mark strings in AuthTokenSerializer as translatable
Mark strings in AuthTokenSerializer as translatable

  from django.contrib.auth import authenticate
+ from django.utils.translation import ugettext_lazy as _
+ 
  from rest_framework import serializers
  
  
  class AuthTokenSerializer(serializers.Serializer):
      username = serializers.CharField()
      password = serializers.CharField()
  
      def validate(self, attrs):
          username = attrs.get('username')
          password = attrs.get('password')
  
          if username and password:
              user = authenticate(username=username, password=password)
  
              if user:
                  if not user.is_active:
+                     msg = _('User account is disabled.')
-                     raise serializers.ValidationError('User account is disabled.')
+                     raise serializers.ValidationError()
                  attrs['user'] = user
                  return attrs
              else:
-                 raise serializers.ValidationError('Unable to login with provided credentials.')
+                 msg = _('Unable to login with provided credentials.')
+                 raise serializers.ValidationError(msg)
          else:
-             raise serializers.ValidationError('Must include "username" and "password"')
+             msg = _('Must include "username" and "password"')
+             raise serializers.ValidationError(msg)
  
Mark strings in AuthTokenSerializer as translatable
## Code Before:
from django.contrib.auth import authenticate
from rest_framework import serializers


class AuthTokenSerializer(serializers.Serializer):
    username = serializers.CharField()
    password = serializers.CharField()

    def validate(self, attrs):
        username = attrs.get('username')
        password = attrs.get('password')

        if username and password:
            user = authenticate(username=username, password=password)

            if user:
                if not user.is_active:
                    raise serializers.ValidationError('User account is disabled.')
                attrs['user'] = user
                return attrs
            else:
                raise serializers.ValidationError('Unable to login with provided credentials.')
        else:
            raise serializers.ValidationError('Must include "username" and "password"')

## Instruction:
Mark strings in AuthTokenSerializer as translatable
## Code After:
from django.contrib.auth import authenticate
from django.utils.translation import ugettext_lazy as _

from rest_framework import serializers


class AuthTokenSerializer(serializers.Serializer):
    username = serializers.CharField()
    password = serializers.CharField()

    def validate(self, attrs):
        username = attrs.get('username')
        password = attrs.get('password')

        if username and password:
            user = authenticate(username=username, password=password)

            if user:
                if not user.is_active:
                    msg = _('User account is disabled.')
                    raise serializers.ValidationError()
                attrs['user'] = user
                return attrs
            else:
                msg = _('Unable to login with provided credentials.')
                raise serializers.ValidationError(msg)
        else:
            msg = _('Must include "username" and "password"')
            raise serializers.ValidationError(msg)
