Python中沒有abstract關鍵字定義抽象類，但是可以通過NotImplementedError類模擬抽象類

def abstract ():

  raise NotImplementedError("Abstract")

class Person:

  def __init__ (self):

    if self.__class__ is Person:

      abstract()

class Student(Person):

  def __init__ (self):

    Person.__init__(self)

    print ("I am student")

stu = Student()

per = Person()

---------- Python ----------

I am student  #這行輸出了

Traceback (most recent call last):

  File "aa.py", line 19, in <module>

    per = Person()

  File "aa.py", line 10, in __init__

    abstract()

  File "aa.py", line 5, in abstract

    raise NotImplementedError("Abstract")

NotImplementedError: Abstract   #直接實例化Person類會報錯

輸出完畢 (耗時 0 秒) - 正常終止