Editing last subfield

[Chelsea Patella]

Hi all,

I've updated to Pymarc v.5 and see that one of my processes doesn't work anymore. I used to be able to edit the last subfield of a field using something like the code below (removes a period at the end of a 245 field). 

record['245'].subfields[-1] = re.sub('\.$', '', record['245'].subfields[-1])

Now I get the error message: TypeError: expected string or bytes-like object

It doesn't work when I use record['245'].subfields[-1].value either. Can anyone tell me how I can edit the punctuation at the end of a field (without knowing the last subfield) in Pymarc v.5?

Thank you!

[Ed Summers]

Hi Chelsea,

> On Nov 15, 2023, at 10:51 AM, 'Chelsea Patella' via pymarc Discussion <pym...@googlegroups.com> wrote:
>
> record['245'].subfields[-1] = re.sub('\.$', '', record['245'].subfields[-1])

Sadly the subfields are now NamedTuples, which are immutable. So this will give you a "AttributeError: can't set attribute” error:

record['245'].subfields[-1].value = re.sub('\.$', '', record['245'].subfields[-1].value)

Maybe someone has a better solution here, but one (tedious) way of approaching this might be to create a variable for the last subfield, and then use it to construct a new subfield:

sf = record['245’].subfields[-1]
record['245'].subfields[-1] = Subfield(sf.code, re.sub('\.$', '', sf.value)

I think using the placeholder variable makes it a bit more readable than this (which looks abysmal):

record['245'].subfields[-1] = Subfield(
record['245'].subfields[-1].code,
re.sub('\.$', '', records['245'].subfields[-1].value
)

//Ed

[Chelsea Patella]

That solved it - thank you!

Chelsea E. Patella, MLIS

Library IT Specialist / Python Developer
Cassidy Cataloguing Services, Inc.
248 W. Main St., Suite 2
Rockaway, NJ 07866

973-586-3200 x6006

www.cassidycataloguing.com

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