[Tutor] Dictionaries - Using 1 Key:Value to find another

[Al Stern]

Ah.  Turns out I was just sloppy and/or stupid.  I realized I had another
error once I fixed the '==' part.

My new code which seems to work is...

elif choice == "8":
        print ("Find the grandson of a person in the list.")
        grandfather = input("Which father do you want to look up to see if
he is a grandfather? ")
        if grandfather in pairs:
            father = pairs[grandfather]
            grandson = pairs[father] 
            print (grandfather, "is the grandfather of", grandson, ".")
        else:
            print ("\nSorry.", grandfather, "is not a grandfather.  Try
again.")
            
Thanks all.
_________________
 
www.electronsbaseball.com

-----Original Message-----
From: David [mailto:bouncingcats at gmail.com] 
Sent: Saturday, December 11, 2010 6:35 PM
To: Al Stern
Cc: tutor at python.org
Subject: Re: [Tutor] Dictionaries - Using 1 Key:Value to find another

On 12 December 2010 11:10, Al Stern <albstern at gmail.com> wrote:
>
> I thought father got defined in the
>
> father == pairs[grandfather]
> line.  I have tried it a couple different ways but always get the father
is
> not defined error once I enter the name.

I only glanced at your code, but maybe you have some typos there:

            father == pairs[grandfather]
            for father in pairs:
                grandson == pairs[father]

should probably be
            father = pairs[grandfather]
            for father in pairs:
                grandson = pairs[father]

Try that.