class alien:
    # A property of all aliens
    appearance = 'ugly'

ET = alien()
Alf = alien()
Yoda = alien()

print(ET.appearance, Alf.appearance, Yoda.appearance)

ET.color = 'red'
ET.head = 'giant'
ET.planet = 'Mars?'

Alf.color = 'yellow'
Alf.head = 'funny with an elephant trompe'
Alf.planet = 'Melmac'

Yoda.color = 'green'
Yoda.head = 'wrinkled with long hairy ears'
Yoda.planet = 'Jupitron'

print('ET:',ET.appearance,ET.color, ET.planet, ET.head)
print('Alf:',Alf.appearance,Alf.color, Alf.planet, Alf.head)
print('Yoda:',Yoda.appearance,Yoda.color, Yoda.planet, Yoda.head)

alien.appearance = 'handsome stallion'
print(ET.appearance,Alf.appearance,Yoda.appearance)

# Second version of the alien class
class alienV2(object):
    # Class variable
    number = 0
    
    # Initialization function
    def __init__(self, name, color, planet, head):
        # Instance variables
        self.name = name
        self.color = color
        self.planet = planet
        self.head = head
        alienV2.number += 1
    
    # A class function
    def speak(self):
        print('My name is ' + self.name + ' from the planet ' + self.planet + '; my head is '
              + self.head + ', and my skin gets more and more ' + self.color + 
               ' when I tan in the sun. There are other ' + str(alienV2.number -1) + ' aliens like me hiding in this code.')
        print(' ')

alien_1 = alienV2('ET','red','Mars','big')
alien_2 = alienV2('Alf','yellow','Melmac','funny with an elephant trompe')
alien_3 = alienV2('Yoda','green','Jupitron','wrinkled with long hairy ears') 

alien_3.speak()

alienV2.number = 0
alien_list = [] 
alien_list.append(alienV2('ET','red','Mars','big'))
alien_list.append(alienV2('Alf','yellow','Melmac','funny with like an elephant trompe'))
alien_list.append(alienV2('Yoda','green','Jupitron','wrinkled with long hairy ears'))

for i in range(len(alien_list)):
    alien_list[i].speak()

class your_class(object):
    # Class variables here
    
    def __init__(self,instance_var):
        # Instance variables here (and in the init function)
        self.instance_var = instance_var
    
    # Define a functon or action for your object
    def action(self):
        # Do something, like:
        self.instance_var = 0
#define child class
class child_class(parent_class):
   # initialization is not neccesary
   def __init__(self):
      print "Calling child constructor"

   def childMethod(self):
      print 'Calling child method'
# Define a child class that has alienV2 as parent class
%pylab inline
from IPython.display import Image

class alien_interactive(alienV2):
    
    # Initialize child class function 
    def __init__(self, imgsrc, name, color, planet, head):
        super(alien_interactive, self).__init__(name, color, planet, head)
        self.imgsrc = imgsrc 
   
    def show_yourself(self):
        img = Image(filename=self.imgsrc)
        display(img)
        self.speak()

alien_list = []
alienV2.number = 0 # Note it's not alien_interactive.number
alien_list.append(alien_interactive('images/ET.jpg','ET','red','Mars','big'))
alien_list.append(alien_interactive('images/Alf.jpg','Alf','yellow','Melmac','funny with like an elephant trompe'))
alien_list.append(alien_interactive('images/yoda.jpg','Yoda','green','Jupitron','wrinkled with long hairy ears'))

alien_list[1].show_yourself()

from IPython.html.widgets import interact

def show_interactive(alien_number):
    alien_list[alien_number].show_yourself()

interact(show_interactive, alien_number=(0,2));

class your_class_child(your_class):
    
    # Initialize child class function 
    def __init__(self, child_instance_variable, parent_instance_variable):
        super(your_class_child, self).__init__(parent_instance_variable)
        # Define child instance variables
        self.child_instance_variable = child_instance_variable
    
    # Add an action unique to the child class
    def child_action(self):
        # Do something, like
        self.child_instance_variable = 0

# Define a child class that has alienV2 as parent class
class alien_interactiveV2(alienV2):
    
    # Initialize child class function 
    def __init__(self, imgsrc,*args):
        super(alien_interactiveV2, self).__init__(*args)
        self.imgsrc = imgsrc 
        
    def show_yourself(self):
        try:
            img = Image(filename=self.imgsrc)
        except:
            img = Image(url=self.imgsrc)
        display(img)
        self.speak()

alien_list.append(alien_interactiveV2('http://tinyurl.com/mnwj7wj','Ridley Scott','white','LV223','voluptuous'))
interact(show_interactive, alien_number=(0,3));

# Define a child class that has alienV2 as parent class
class alien_interactiveV3(alienV2):
    
    # Initialize child class function 
    def __init__(self, *args,**kwargs):
        super(alien_interactiveV3, self).__init__(**kwargs)
        self.imgsrc = args[0] 
        
    def show_yourself(self):
        try:
            img = Image(filename=self.imgsrc)
        except:
            img = Image(url=self.imgsrc)
        display(img)
        self.speak()

characteristics = {'head':"like Homer Simpson's with tentacles",
                   'name':'Zoidberg', 
                   'color':'pink', 
                   'planet':' Decapod 10'}
alien_list.append(alien_interactiveV3('http://tinyurl.com/ngdd6ul',**characteristics))
interact(show_interactive, alien_number=(0,4));


txt = 'my name is Zoidberg'

txt

txt.upper()

import numpy as np

np.__name__

np.__class__

np.

class Integrator:
    def __init__(self, a, b, n):
        self.a, self.b, self.n = a, b, n
        self.points, self.weights = self.method()
        
    def method(self):
        raise NotImplementedError('no rule in class %s' %self.__class__.__name__)