零基础Python的第391页项目的settings.py文件:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'djdb',
        'USER': 'root',
        'PASSWORD': '123456',
        'HOST': 'localhost',
        'PORT': '3306'
    }
}

报错:     return Database.connect(**conn_params)
  File "D:\scs\python\Django\venvdj\lib\site-packages\pymysql\__init__.py", line 94, in Connect
    return Connection(*args, **kwargs)
  File "D:\scs\python\Django\venvdj\lib\site-packages\pymysql\connections.py", line 325, in __init__
    self.connect()
  File "D:\scs\python\Django\venvdj\lib\site-packages\pymysql\connections.py", line 630, in connect
    raise exc
django.db.utils.OperationalError: (2003, "Can't connect to MySQL server on '127.0.0.1' ([WinError 10061] 由于目标计算机
积极拒绝，无法连接。)")