給定一堂課：from django.db import modelsclass Person(models.Model):    name = models.CharField(max_length=20)是否有可能（如果有的話）擁有一個基于動態參數進行過濾的QuerySet？例如： # Instead of: Person.objects.filter(name__startswith='B') # ... and: Person.objects.filter(name__endswith='B') # ... is there some way, given: filter_by = '{0}__{1}'.format('name', 'startswith') filter_value = 'B' # ... that you can run the equivalent of this? Person.objects.filter(filter_by=filter_value) # ... which will throw an exception, since `filter_by` is not # an attribute of `Person`.