Python中的构造函数

class A():    def __init__(self):      pass

class SampleClass():  def __init__(self):    print("it a sample class constructor")# creating an object of the class A = SampleClass()

it a sample class constructor

class A():    check_value = 1000    # a method    def value(self):        print(self.check_value)# creating an object of the classobj = A()# calling the instance method using the objectobj.value()

1000

dir(A)Output:['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'check_value', 'value']

class Family:   members = 10   def __init__(self, count):      self.members = count      def disply(self):      print("Number of members is", self.members)  joy_family = Family(25)joy_family.disply()

Number of members is 25

class Player:   def __init__(self):      self.position = 0      # Add a move() method with steps parameter        def move(self, steps):      self.position = steps      print(self.position)      def result(self):      print(self.position)player1 = Player()print('player1 results')player1.move(2)player1.result()print('p2 results')p2 = Player()p2.result()

player1 results22p2 results0