getting an error 'AttributeError:' in Python

Question

I have written the below script using python:

class Fruit:

  def __init__(self,name):
      self.name = name
      print "Initialized Fruit Name: %s" % self.name

  def tell(self):
      print "U have entered the fruit as %s" % self.name

class Sweet(Fruit):

  def __init__(self,name,taste,price):
      Fruit.__init__(self,name)
      self.taste = taste
      print "Initialized the name of the fruit as %s" % self.name

  def tell(self):
      Fruit.tell(self)
      print "Taste of the fruit is %s" % self.taste

  def sayPrice(self):
      Fruit.tell(self)                 
      print "The price of the fruit Mango is %d" % self.price

class Salt(Fruit):

  def __init__(self,name,taste,price):
      Fruit.__init__(self,name)
      self.taste = taste
      print "Initialized the name of the fruit as %s" % self.name

  def tell(self):
      Fruit.tell(self)
      print "Taste of the fruit is %s" % self.taste

  def sayPrice(self):
      Fruit.tell(self)
      print "The price of the fruit Strawberry is %d" % self.price

m = Sweet('Mango','sweet',100)

s = Salt('Strawberry','salty',50)

choice = raw_input("enter ur choice:(Mango/Strawberry):")

if choice == 'Mango':
    m.tell()
else:
    s.tell()

decision = raw_input("Do U want to know the price?(Y/N)")

if decision == 'Y' and choice == 'Mango':

    m.sayPrice()
elif decision == 'Y' and choice == 'Strawberry':

    s.sayPrice() 
else:
    print "Sad to see U go :(, please do visit next time again"

And below is the error I am getting:

Traceback (most recent call last):

File "C:/Python26/Inheritance_practice2.py", line 47, in
m.sayPrice()
File "C:/Python26/Inheritance_practice2.py", line 21, in sayPrice
print "The price of the fruit Mango is %d" % self.price
AttributeError: Sweet instance has no attribute 'price'

NOTE: The error is thrown when the user wants to know the price of the chosen fruit.

Please cut this down to a minimal example; we don't need to see everything. But you never assign self.price, so this shouldn't have been surprising. — jonrsharpe
– jonrsharpe, Commented Aug 7, 2014 at 20:12
And where do you think you are setting the price? Point to the code that does it. — Daniel Roseman
– Daniel Roseman, Commented Aug 7, 2014 at 20:14
For the love of all that is pythonic, please wrap up your script code with a if __name__ == "__main__":. — James Mertz
– James Mertz, Commented Aug 7, 2014 at 20:28
Also, why bother always passing 'salty' to Salt? Surely taste should be a Fruit attribute, then e.g. Salt doesn't take that argument and always passes 'salty' to super(Salt, self).__init__(...)? That way all Fruit has a taste, and all Salt has taste == 'salty'. — jonrsharpe
– jonrsharpe, Commented Aug 7, 2014 at 20:47
How can I do the wrapping of this code using if ______name______ = "______main______" could you please paste the code here.Thanks. — python_beginner
– python_beginner, Commented Aug 8, 2014 at 10:23

mdurant · Accepted Answer · 2014-08-07 20:14:30Z

4

You need self.price=price in the __init__ methods - currently you are just throwing that parameter away.

answered Aug 7, 2014 at 20:14

mdurant

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Comments

dwitvliet · Accepted Answer · 2014-08-07 20:19:57Z

2

You need to add self.price, preferably to Fruit:

class Fruit:
    def __init__(self,name,price):
        self.name = name
        self.price = price #set price when initiated.
        (...)

class Sweet(Fruit):
    def __init__(self,name,taste,price):
        Fruit.__init__(self,name,price) #send price as init parameter
        self.taste = taste
        print "Initialized the name of the fruit as %s" % self.name
    (..)

edited Aug 7, 2014 at 20:19

answered Aug 7, 2014 at 20:14

dwitvliet

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1 Comment

Marcin Over a year ago

Strictly not to the classes, but to the instances.

Juan David · Accepted Answer · 2014-08-07 20:32:04Z

Maybe is a better option add that attribute to you parent class fruit

class Fruit:

  def __init__(self,name, price):
      self.name = name
      self.price = price
      print "Initialized Fruit Name: %s" % self.name

  def tell(self):
      print "U have entered the fruit as %s" % self.name

class Sweet(Fruit):

  def __init__(self,name,taste,price):
      Fruit.__init__(self,name, price)
      self.taste = taste
     print "Initialized the name of the fruit as %s" % self.name

  def tell(self):
      Fruit.tell(self)
      print "Taste of the fruit is %s" % self.taste

  def sayPrice(self):
      Fruit.tell(self)                 
      print "The price of the fruit Mango is %d" % self.price

class Salt(Fruit):

  def __init__(self,name,taste,price):
      Fruit.__init__(self,name, price)
      self.taste = taste
      print "Initialized the name of the fruit as %s" % self.name

  def tell(self):
      Fruit.tell(self)
      print "Taste of the fruit is %s" % self.taste

  def sayPrice(self):
      Fruit.tell(self)
      print "The price of the fruit Strawberry is %d" % self.price

Works fine as well. Also you can add a getter in your Fruit class to obtain the price, saving lines of code and using the advantage given by the OOP because your children classes are inheriting the method

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