python笔记

1.python打印异常信息

  try:
      game = Game.objects.get(game_id=game_id, language=language)
      print(game.pk)
  except:
      print(sys.exc_info())

2.Django将imagefield序列化以获取完整的URL

model.py

class UserG(models.Model):
    username = models.CharField(max_length=128, default='luyou', unique=True)
    icon = models.ImageField(upload_to='./static/images/%Y%m%d/',null=True, 
                            max_length=255,default="static/images/20160924/default.png")

Serializers.py

class UserGSerializer(serializers.ModelSerializer):
    icon = serializers.SerializerMethodField()#加上这行后必须添加get_icon()方法否则报错

    def get_icon(self, userg):
        return str(userg.icon)

    class Meta:
        model = UserG
        fields = ('username', 'icon')

views.py

class UserGDetail(APIView):
    def get(self, request, format=None):
        serializer = UserGSerializer(userg)
        data = serializer.data
        return Response(data)

使用SerializerMethodField后能够返回完整得URL否则url中得：将会变成%3A返回。