[Tutor] ftplib with classes

[alan.gauld@bt.com]

>     I'm trying to get my hands dirty with using classes ... 
> different story. Looking at the doc for ftplib I see:
> 
> Now the code I have as of now is:
> 
> import ftplib
> 
> class Connection:
>     def __init__(self, host='', user='', passwd='', acct=''):
>         self.user = username
>         self.host = hostname
>         self.passwd = password
> 
> Am I doing this right? 

So far so good. You can now create a connection instance 
and pass it the details it needs.

> Also, for connecting ( connect())  would I use 
> that as a method? 

You probably want to make it a method taking some parameters which are
defaulted to the self ones:

def connect(self,  host=self.host,user=self.user,...etc)

You might also like to automatically connect within 
the init method iff you have the requireddata.

Add after your code:

if self.host != '' and self.user != '' and...
   self.connect()

Then whehn you come to use your class it looks like this:

import ftpClass

conn1 = ftpClass.Connection()   # no connection made yet
conn2 = ftpClass.Connection('ftp.google.com', 'anonymous', 'me@foo.com')

conn1.connect('ftp.bigbiz.com','agauld', 'ninini')

files = conn1.ls()
theFile = conn1.get(files[0])
conn1.close()

conn2.put(files[0])
conn2.close()

And so on. In designing a class it's a good idea to run one 
of these imaginary usage scenarios to help decide what 
the methods should look like from the client perspective...

HTH,

Alan g.