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Nancy  
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 More options Jul 10 2012, 1:15 pm
From: Nancy <eclecticna...@gmail.com>
Date: Tue, 10 Jul 2012 10:15:18 -0700 (PDT)
Local: Tues, Jul 10 2012 1:15 pm
Subject: Inheritance
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I'm experimenting with inheritance and could use some guidance.

Here's what I have, after fighting off error messages on previous attempts.
:-)

import ftplib
class myftp(ftplib.FTP):
    def __init__(self):
        self.FTP = ftplib.FTP()    

This appears to do what I want it to do* (see below).
But should I be setting it up differently than shown above?

*As an example, I can do the following and it works.

ftp = myftp()
ftp.connect(host)
ftp.login(user, passwd)
# etc
ftp.close()

Thanks for any input, thanks!
-Nancy


 
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Jay Wren  
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 More options Jul 10 2012, 1:30 pm
From: Jay Wren <jrw...@gmail.com>
Date: Tue, 10 Jul 2012 13:30:03 -0400
Local: Tues, Jul 10 2012 1:30 pm
Subject: Re: Inheritance
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That works, but you are allocating and initializing the FTP member and never using it.

import ftplib
class myftplib(ftplib.FTP):
    def __init__(self):
        pass

would work just the same, and for that matter, so would:

class myftplib(ftplib.FTP):
  pass

--

On Jul 10, 2012, at 1:15 PM, Nancy wrote:


 
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Ryan Burns  
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 More options Jul 10 2012, 2:14 pm
From: Ryan Burns <rdbu...@gmail.com>
Date: Tue, 10 Jul 2012 14:14:29 -0400
Local: Tues, Jul 10 2012 2:14 pm
Subject: Re: Inheritance
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If you wanted to pass some of your own arguments to your own init and also
use the original init you can also do that:

import ftplib
class MyFTPLib(ftplib.FTP):
   def __init__(self,custom,host):
      ftplib.FTP.__init__(self,host)
      self.custom = custom

This stackoverflow thread has some more discussion about this kind of thing:
http://stackoverflow.com/questions/576169/understanding-python-super-...

I'm sure you can also take a variable number of arguments to match the FTP
init precisely, I think you would say something like *args and then pass
that to the FTP init?

- As an aside, the Python style
guide<http://www.python.org/dev/peps/pep-0008/>recommends using
CapWords for class names.

--
about.me/ryanburns

 
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Paul Woolcock  
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 More options Jul 10 2012, 1:26 pm
From: Paul Woolcock <pwool...@gmail.com>
Date: Tue, 10 Jul 2012 13:26:36 -0400
Local: Tues, Jul 10 2012 1:26 pm
Subject: Re: Inheritance
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It would be better to use `super` instead:

    import ftplib
    class MyFTP(ftplib.FTP):
        def __init__(self):
            super(MyFTP, self).__init__()

Here is the python documentation on `super`:
http://docs.python.org/library/functions.html?highlight=super#super

--
Paul Woolcock
Twitter @pwoolcoc
Github @pwoolcoc

 
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Nancy  
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 More options Jul 10 2012, 2:57 pm
From: Nancy <eclecticna...@gmail.com>
Date: Tue, 10 Jul 2012 11:57:03 -0700 (PDT)
Local: Tues, Jul 10 2012 2:57 pm
Subject: Re: Inheritance
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I appreciate the feedback! So far, now, I have:

import ftplib
class MyFTP(ftplib.FTP):
    def __init__(self):
        pass

I do plan to do some "custom" but am not there yet :)

I did try this (in place of "pass"):  super(MyFTP, self).__init__()
TypeError: super() argument 1 must be type, not classobj

Thanks again,
-Nancy


 
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Nancy  
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 More options Jul 10 2012, 3:02 pm
From: Nancy <eclecticna...@gmail.com>
Date: Tue, 10 Jul 2012 15:02:16 -0400
Local: Tues, Jul 10 2012 3:02 pm
Subject: Re: Inheritance
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Also I should have mentioned (though don't think it's been a factor yet):

Py 2.6 on Win

-Nancy
On Jul 10, 2012 2:57 PM, "Nancy" <eclecticna...@gmail.com> wrote:


 
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Ryan Burns  
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 More options Jul 10 2012, 3:11 pm
From: Ryan Burns <rdbu...@gmail.com>
Date: Tue, 10 Jul 2012 15:11:24 -0400
Local: Tues, Jul 10 2012 3:11 pm
Subject: Re: Inheritance
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I tried this exact code;

import ftplib
class MyFTP(ftplib.FTP):
    def __init__(self):
        super(MyFTP,self).__init__()

And it didn't throw any errors.  A quick google indicated this error can
occur if the parent class you are inheriting from is not a new-style class.
 I'm not sure why that would be the case in your case, although I am on
2.7.

--
about.me/ryanburns

 
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Ryan Burns  
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 More options Jul 10 2012, 3:18 pm
From: Ryan Burns <rdbu...@gmail.com>
Date: Tue, 10 Jul 2012 15:18:32 -0400
Local: Tues, Jul 10 2012 3:18 pm
Subject: Re: Inheritance
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Ahaha, the ftplib.FTP class is an old style class in the 2.6 release.

Huh, I checked both the 2.6.8 and 2.7.3 ftplib source and it's an old style
class in both.  I'm not sure why it worked for me.

You can still use ftplib.FTP.__init__(self)      - super() only really
matters if you have multiple inheritance (feel free to disabuse me of that
notion if it's not the case).

-Ryan

--
about.me/ryanburns

 
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Ryan Burns  
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 More options Jul 10 2012, 3:23 pm
From: Ryan Burns <rdbu...@gmail.com>
Date: Tue, 10 Jul 2012 15:23:01 -0400
Local: Tues, Jul 10 2012 3:23 pm
Subject: Re: Inheritance
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Oh, it worked for me because I didn't create an instance of MyFTP when I
tested it, and that is of course when the error occurs.

Long story short: you can't use super() if you're inheriting from
ftplib.FTP in that version of Python, but in general it's the way to go.

--
about.me/ryanburns

 
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Nancy  
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 More options Jul 10 2012, 4:11 pm
From: Nancy <eclecticna...@gmail.com>
Date: Tue, 10 Jul 2012 16:11:27 -0400
Local: Tues, Jul 10 2012 4:11 pm
Subject: Re: Inheritance
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I appreciate the clarification on super() - Thanks!
On Jul 10, 2012 3:23 PM, "Ryan Burns" <rdbu...@gmail.com> wrote:


 
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