[Tutor] Question about Classes

[Gustavo Tabares]

Matt,

	By subclassing the class "Email", you are overwriting the __init__ function 
in the Email class. This means that the instance of Contact has no clue about 
the statement:

	self.emails = []

in the Email class. You can try placing this statement in the __init__ of 
Contact, or make it all one class, or whatever else you might think of.


Gus


On Monday 24 November 2003 14:08, mlong at datalong.com wrote:
> In an effort to understand how classes work I have created 2 classes. After
>
> importing the class I get the following error:
> >>> reload(Contact)
>
> <module 'Contact' from 'Contact.pyc'>
>
> >>> p=Contact.Contact(firstName='Joe', lastName='Blow')
> >>> p.showContactInfo()
>
> 'Joe Blow'
>
> >>> p.addEmail('mlong','datalong')
>
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
>   File "Contact.py", line 10, in addEmail
>     self.emails.append(seq)
> AttributeError: Contact instance has no attribute 'emails'
>
> My question is how do I initialize the variables in the class Email?
>
>
> Here are the class definitions:
>
> class Email:
> 	def __init__(self):
> 		self.emails=[]
>
> 	def showEmail(self):
> 		return self.emails
>
> 	def addEmail(self, email, type):
> 		seq = (type, email)
> 		self.emails.append(seq)
>
>
> class Contact(Email):
> 	def __init__(self
> 		,firstName=''
> 		,lastName=''
> 		):
> 		""" Initial object """
> 		self.firstName=firstName
> 		self.lastName=lastName
>
> 	def updateContact(self
> 		,firstName
> 		,lastName
> 		):
> 		""" Save Contact Information """
> 		self.firstName=firstName
> 		self.lastName=lastName
>
> 	def showContactInfo(self):
> 		return self.firstName + ' ' + self.lastName
>
>
> Thanks,
> Mike
>
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