generator expression works in shell, NameError in script

[ssc]

Hello,

I am trying to generate this list of tuples:
[(0, ''), (1, 'Dr'), (2, 'Miss'), (3, 'Mr'), (4, 'Mrs'), (5, 'Ms')]

My code works fine in the Python shell:

>>> titles = ['Dr', 'Miss', 'Mr', 'Mrs', 'Ms',]
>>> title_choices = [(0, '')] + list((titles.index(t)+1, t) for t in titles)
>>> title_choices
[(0, ''), (1, 'Dr'), (2, 'Miss'), (3, 'Mr'), (4, 'Mrs'), (5, 'Ms')]

The same code run in a script fails with
NameError: global name 'titles' is not defined

Does anybody know why ? How can I fix the error ?

Thank you very much :-)

Steve
-- 
http://mail.python.org/mailman/listinfo/python-list

Re: generator expression works in shell, NameError in script

[ssc]

Wow! Didn't expect that kind of instant support. Thank you very much,
I'll give both zip and enumerate a try.

The code I've shown is actually copied pretty straight from a Django
form class, but I didn't want to mention that as not to dilute the
conversation. Don't think it matters, anyway. This is the relevant
excerpt:

from django.forms import Form

class SignupForm(Form):

titles = ['Dr', 'Miss', 'Mr', 'Mrs', 'Ms',]
title_choices   = [(0, '')] + list((titles.index(t)+1, t) for t in
titles)

Now that I look at it again, it seems odd to me to not have the code
e.g. in __init__(...), but just 'class-global'.
Still, that does not seem a reason for titles not to be not defined,
as I do define it just in the line above.

Does the generator expression have its own little namespace or so ?
-- 
http://mail.python.org/mailman/listinfo/python-list

Re: generator expression works in shell, NameError in script

[ssc]

On Jun 18, 10:49 am, Jon Clements  wrote:
> Why are you doing this? I'm assuming a code to title look up is
> required (don't forget military, royal and honorable titles
> etc... :) )

I'm in New Zealand. Hardly any need for military titles, rarely any
for royal and damn sure none for honorable :-D (scnr)
-- 
http://mail.python.org/mailman/listinfo/python-list