原文：https://www.cnblogs.com/linxiyue/p/4060817.html
Django的权限系统很简单，它可以赋予users或groups中的users以权限。
Django admin后台就使用了该权限系统，不过也可以用到你自己的代码中。
User对象具有两个ManyToManyField字段，groups和user_permissions
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groups
=
models.ManyToManyField(Group, verbose_name
=
_(
'groups'
),
blank
=
True
, help_text
=
_(
'The groups this user belongs to. A user will '
'get all permissions granted to each of '
'their groups.'
),
related_name
=
"user_set"
, related_query_name
=
"user"
)
user_permissions
=
models.ManyToManyField(Permission,
verbose_name
=
_(
'user permissions'
), blank
=
True
,
help_text
=
_(
'Specific permissions for this user.'
),
related_name
=
"user_set"
, related_query_name
=
"user"
)
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可以像其它的django Model一样来访问他们：
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myuser.groups
=
[group_list]
myuser.groups.add(group, group, ...)
myuser.groups.remove(group, group, ...)
myuser.groups.clear()
myuser.user_permissions
=
[permission_list]
myuser.user_permissions.add(permission, permission, ...)
myuser.user_permissions.remove(permission, permission, ...)
myuser.user_permissions.clear()
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权限Permissions
权限是作为一个Model存在的，建立一个权限就是创建一个Permission Model的实例。
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@python_2_unicode_compatible
class
Permission(models.Model):
"""
The permissions system provides a way to assign permissions to specific
users and groups of users.
The permission system is used by the Django admin site, but may also be
useful in your own code. The Django admin site uses permissions as follows:
- The "add" permission limits the user's ability to view the "add" form
and add an object.
- The "change" permission limits a user's ability to view the change
list, view the "change" form and change an object.
- The "delete" permission limits the ability to delete an object.
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