[python] mailbox -- Question on usage

[David Stockwell]

Hi,
After looking at http://docs.python.org/lib/module-mailbox.html  I am a bit 
confused.

The bottom of the page refers to some shortcut usage for getting a mail box

import email
import mailbox

mbox = mailbox.UnixMailbox(fp, email.message_from_file)

My question is what is fp?   and how come you don't have to say 
email.message_from_file(fileName) on the second parameter?

Is fp supposed to be something like this?

myname = 'mymailboxfilename'
fp = open(myname)

Then

mbox = mailbox.UnixMailbox(fp, email.message_from_file(myname) )  ????

I tried executing the original statement in python (the one from the 
website) and it seemed to take it.

So what does it mean to specify the second parameter like that?
mbox = mailbox.UnixMailbox(fp, email.message_from_file)

Finally, where can I find a list of all the apis that I can call for 
mailbox?
So far I have only found one 'next()'  that returns a message object.

Thanks in advance,

David
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