lcsh_to_lcgft

Python 3 script to replace certain LCSHs used as genre/form headings with LCGFT equivalents

What you need

1. Python 3
2. pymarc
3. List that include LCSHs and their LCGFT equivalents and URIs (example: replace.csv)
4. MARC file

Background

At our library, appx. 4,460 LCSHs are used as genre/form headings in our records, of which 496 LCSHs can be replaced with their LCGFT equivalents. For example,

LCSH	LCGFT	LCGFT URI
Dissertations, Academic.	Academic theses	http://id.loc.gov/authorities/genreForms/gf2014026039
Account books.	Account books	http://id.loc.gov/authorities/genreForms/gf2017026136
Action and adventure films.	Action and adventure films	http://id.loc.gov/authorities/genreForms/gf2011026005
Adventure films.	Action and adventure films	http://id.loc.gov/authorities/genreForms/gf2011026005
Action films.	Action and adventure films	http://id.loc.gov/authorities/genreForms/gf2011026005
Action and adventure television programs.	Action and adventure television programs	http://id.loc.gov/authorities/genreForms/gf2011026006
Adventure television programs.	Action and adventure television programs	http://id.loc.gov/authorities/genreForms/gf2011026006
Administrative regulations.	Administrative regulations	http://id.loc.gov/authorities/genreForms/gf2011026030
Aerial views.	Aerial views	http://id.loc.gov/authorities/genreForms/gf2011026033

Now that LCGFT is our primary thesaurus for genre/form headings, using this script, we update a 655 field like this.
from: 655 \0 $a Dissertations, Academic.
to: 655 \7 $a Academic theses. $2 lcgft $0 http://id.loc.gov/authorities/genreForms/gf2014026039

Note: If the LCSH doesn't have LCGFT equivalent, we leave it as is.