Django QuerySet 文档对此非常清楚:

get(**kwargs)¶

返回匹配给定的对象查找参数，应该在字段查找中描述的格式.

Returns the object matching the given lookup parameters, which should be in the format described in Field lookups.

get() 引发 MultipleObjectsReturned如果发现不止一个物体.这MultipleObjectsReturned 异常是模型类的一个属性.

get() raises MultipleObjectsReturned if more than one object was found. The MultipleObjectsReturned exception is an attribute of the model class.

get() 引发一个DoesNotExist 异常如果找不到对象给定参数.这个例外是也是模型类的一个属性.

get() raises a DoesNotExist exception if an object wasn't found for the given parameters. This exception is also an attribute of the model class.

filter(**kwargs)

返回一个包含与给定查找参数匹配的对象的新 QuerySet.

Returns a new QuerySet containing objects that match the given lookup parameters.

当您想获得单个唯一对象时，基本上使用get()，当您想获得时使用filter()>与您的查找参数匹配的所有对象.

Basically use get() when you want to get a single unique object, and filter() when you want to get all objects that match your lookup parameters.