class Student(models.Model): s_name = models.CharField(max_length=20,db_column="name",unique=True) s_age = models.IntegerField(db_column="age") s_sex = models.BooleanField(max_length=2,db_column="sex") @classmethod def create_people(cls,name,age=100,sex=True): cls_1 = cls() cls...
from django.db import models # Create your models here. class Question(models.Model): question_text=models.CharField(max_length=200) pub_date=models.DateTimeField(name='published time') def __str__(self) -> str: return self.question_text class Choice(models.Model): question=models.ForeignKey...
from .filter import TestFilter class BookAPIView(ListAPIView): queryset = Book.objects serializer_class = BookSerializer filter_backends = [DjangoFilterBackend] # 必须用加DjangoFilterBackend或其子类 filterset_class = TestFilter # 把自定义的过滤加上 1. 2. 3. 4. 5. 6. 7. 8. 过滤器和查找...
35. issubclass(class, classinfo)：如果class是classinfo的派生类，则返回True；否则返回False。36. iter(obj[, sentinel])：返回一个迭代器对象。37. len(obj)：返回对象obj的长度（元素个数）。38. list(iterable)：将可迭代对象iterable转换为列表。39. locals()：返回当前局部符号表的字典。40. map(...
ManyToManyField(to=Tag, related_name="notes", null=True) # Tag模型(数据表) class Tag(models.Model): ... 多对多关系的访问方法不是十分直观的。正向访问(依据Article的信息访问与之相关联的Tag的信息): # Article实例化 article = Article.objects.all() # 通过实例article的tag属性,就可以访问和这个...
class_method() # 输出:10 11.compile(source, filename, mode[, flags[, dont_inherit]]): 编译源代码为代码或AST对象。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 source = "print('Hello, World!')" code = compile(source, filename="", mode="exec") exec(code) # 输出:Hello, ...
class Student(Person): name = "zhangsan" age = 21 res = issubclass(Student,Person) #判断Student是Person的子类 print(res) #输出 : True 5.staticmethod() 功能: 返回函数的静态方法。 语法格式: staticmethod() 实例: ...
class Student: def __init__(self, name, grade, age): self.name = name self.grade = grade self.age = age def __repr__(self): return repr((self.name, self.grade, self.age)) student_objects = [ Student('john', 'A', 15), Student('jane', 'B', 12), Student('dave', 'B'...
classLoginView(JsonResponseMixin, generic.TemplateView):template_name ='login.html'defpost(self, request, *args, **kwargs):data = json.loads(request.body.decode())stu = models.Student.objects.filter(**data).first()ifnotstuorstu.passkey != data['passkey']:returnself._jsondata('账号或密码错...
! ! ! /* A tuple of class objects */ /* A dictionary */ /* A string */ PyObject!*cl_getattr; PyObject!*cl_setattr; PyObject!*cl_delattr; } PyClassObject; 因为 New-Style Class,Class 和 Type 总算是⼀一回事了. 93 >>> class User(object): pass >>> u = User() >>> type...