[Tutor] Global var not defined?

[leam hall]

Well, I'm happy to change things but my python is only so good. And much of
that is based off of shell programming.

What the data looks like is fairly simple. I have a spreadsheet of host
information. Customer 'Alan' may have a dozen or so servers and customer
Ramit has another dozen or two. When I print these out they will be sorted
by customer but rolled into a single file.

The line "host_list[cust] = {}" creates the customer dictionary if that
customer doesn't exist. Then there's a host key with multiple layers:

   host_list['alan']['webserver']['ip'] = '12.23.34.45'
   host_list['alan']['webserver']['environ'] = 'Dev'

Make sense? As I do not know a lot about classes I'm not sure they are
better in this case than a multi-level dictionary. The data does not get
altered, just organized.

Leam


On Tue, Aug 27, 2013 at 2:34 PM, Prasad, Ramit <ramit.prasad at jpmorgan.com>wrote:

> leam hall wrote:
> > Could use some help with this. Python 2.4.3 on RHEL 5.x.
> >
> > In the functions file that gets imported:
> >
> > def append_customer(line_list):
> >         global customers
> >         cust = line_list[0]     // list with Customer info in [0]
> >         cust = clean_word(cust)  // Trims white space
> >
> >         if len(cust) and cust not in customers:
> >                 host_list[cust] = {}
> >                 customers.append(cust)
> >
> > In the calling file:
> >
> >
> > import functions
> > import sys
> >
> > customers = []
> >
> > .
> > .
> > .
> > for line in input_file:
> >     line = line.strip()
> >     if not len(line):
> >         continue
> >     line_list = line.split(',')
> >     functions.append_customer(line_list)
> >
> > Error message:
> > Traceback (most recent call last):
> >   File "./host_tools.py", line 55, in ?
> >     functions.append_customer(line_list)
> >   File "/home/lhall/lang/functions.py", line 27, in append_customer
> >     if len(cust) and cust not in customers:
> > NameError: global name 'customers' is not defined
> >
> >
>
> The problem is because "customers" needs to be defined
> in the module with the append_customers. Global as
> written refers to module level variables.
>
> Some (possible and untested) methods to get around this are:
> 1. pass in customers as an argument
> 2. use globals()?
> 3. add it to functions module `functions.customers = customers`.
>
>
> ~Ramit
>
>
>
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-- 
Mind on a Mission <http://leamhall.blogspot.com/>
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