错误:找不到人

Question

#C:/Python32

class Person:
    def __init__(self, name  = "joe" , age= 20 , salary=0):
        self.name = name
        self.age = age
        self.salary = salary
    def __printData__(self):
            return " My name is {0}, my age is {1} , and my salary is {2}.".format(self.name, self.age, self.salary)
    print(Person)

class Employee(Person):
    def __init__(self, name, age , salary ):
        Person. __init__ (self,name = "Mohamed"  , age = 20 , salary = 100000)
        def __printData__(self):
            return " My name is {0}, my age is {1} , and my salary is {2}.".format(self.name, self.age, self.salary)
    print(Employee)


p= Person()
e = Employee()

Answer 1

您的问题可以简化为:

 class Person:
      print(Person)

这将提出一个NameError.构造类时,将执行类的主体并将其放在特殊的命名空间中.然后type将该命名空间传递给负责实际创建该类的命名空间.

在你的代码中,你正在尝试print(Person)在Person实际创建类之前(在执行类的主体的阶段 - 在它被传递到type并绑定到类名之前),这导致了NameError.