python - Why can I not implement inheritance like this? -

this question has answer here:

• python assignment self in constructor not make object same 4 answers

to begin with, know there right way implement inheritance this:

class parent():     def __init__(self, last_name, eye_color):         self.last_name = last_name         self.eye_color = eye_color  class child(parent):     def __init__(self, last_name, eye_color, number_of_toys):         parent.__init__(self, last_name, eye_color)         self.number_of_toys = number_of_toys  miley_cyrus = child("cyrus", "blue", 5) print(miley_cyrus.last_name) print(miley_cyrus.number_of_toys) 

when run piece of code, there result that

cyrus 5 

however when change 7th line :

self = parent(last_name, eye_color) 

and the code has become:

class parent():     def __init__(self, last_name, eye_color):         self.last_name = last_name         self.eye_color = eye_color  class child(parent):     def __init__(self, last_name, eye_color, number_of_toys):         self = parent(last_name, eye_color)         self.number_of_toys = number_of_toys  miley_cyrus = child("cyrus", "blue", 5) print(miley_cyrus.last_name) print(miley_cyrus.number_of_toys) 

, run piece of code, there error indicates that:

traceback (most recent call last):   file "/users/echo/documents/it/udacity/python/7.inheritance/inherentance.py", line 12, in <module>     print(miley_cyrus.last_name) attributeerror: child instance has no attribute 'last_name' 

what's wrong that? in advance.

i not sure doing can expected result way.

class parent():     def __init__(self, last_name, eye_color):         self.last_name = last_name         self.eye_color = eye_color  class child(parent):      def __init__(self, last_name, eye_color, number_of_toys):         self.obj = parent(last_name, eye_color)         self.number_of_toys = number_of_toys  miley_cyrus = child("cyrus", "blue", 5) print(miley_cyrus.obj.last_name) print(miley_cyrus.number_of_toys) 

self = parent should self.some_variable = parent