A script to filter the MRCONSO table in the UMLS metathesaurus by the TUI semantic value in the MRSTY table

TuiFilterer.py

import csv
mrconso = open("/Path/MRCONSO.RRF", 'r')
mrsty = open("/Path/MRSTY.RRF", 'r')
cuituidict = {}
for line in mrsty.readlines():
    splitline = line.split("|")
    cui = splitline[0]
    tui = splitline[1]
    if(cuituidict.get(cui) == None):
        cuituidict[cui] = [tui]   
    else:
        cuituidict[cui].append(tui)
mrsty.close()      

with open("/Path/LabResultsMRCONSO.RRF", 'w+', newline='') as LabResults:
    LabResults_writer = csv.writer(LabResults, delimiter='|', )
    for line in mrconso.readlines():
        splitline = line.split("|")
        cui = splitline[0]
        if("T034" in cuituidict[cui]):
            splitline[18] = splitline[18].strip("\n")
            LabResults_writer.writerow(splitline)
    mrconso.close()