如何从Django查询中提取字段名和值

from django.db.models import Model

class MyModel(Model):
    field1 = ...
    field2 = ...

queryset = MyModel.objects.all().values('field1', 'field2')

for item in queryset:
    print(item['field1'], item['field2'])

from django.db.models import Count, Model

class MyModel(Model):
    field1 = ...
    field2 = ...

queryset = MyModel.objects.annotate(count=Count('field1')).values('field1', 'count')

for item in queryset:
    print(item['field1'], item['count'])

from django.db.models import Model

class MyModel(Model):
    field1 = ...
    field2 = ...

queryset = MyModel.objects.all().values_list('field1', 'field2')

for item in queryset:
    print(item[0], item[1])

from django.db.models import Model

class MyModel(Model):
    field1 = ...
    field2 = ...
    field3 = ...

queryset = MyModel.objects.all().defer('field3').values('field1', 'field2')

for item in queryset:
    print(item['field1'], item['field2'])

from django.db.models import Model

class MyModel(Model):
    field1 = ...
    field2 = ...
    field3 = ...

queryset = MyModel.objects.all().only('field1', 'field2').values('field1', 'field2')

for item in queryset:
    print(item['field1'], item['field2'])