类“设备”没有“对象”成员pylint

Question

models.py

from django.db import models

class Device(models.Model):
    ip_address = models.CharField(max_length=255)
    hostname = models.CharField(max_length=255)
    username = models.CharField(max_length=255)
    password = models.CharField(max_length=255)
    ssh_port = models.IntegerField(default=22)
    Device = models.CharField(max_length=255)

    VENDOR_CHOICES = (
        ('mikrotik', 'Mikrotik'),
        ('cisco', 'Cisco')
    )
    vendor = models.CharField(max_length=255, choices=VENDOR_CHOICES)

    def __str__(self):
        return "{}. {}".format(self.hostname, self.ip_address)

views.py

from django.shortcuts import render, HttpResponse
from .models import Device

def home(request):

    all_device = Device.objects.all()
    cisco_device = Device.objects.filter(vendor="cisco")
    mikrotik_device = Device.objects.filter(vendor="mikrotik")

    context = {
        'all_device': len(all_device),
        'cisco_device': len(cisco_device),
        'mikrotik_device': len(mikrotik_device)
    }
    return render(request, 'home.html', context)

错误：

  

“设备”类没有“对象”成员pylint（无成员）