proc_martyrologium.py

from os import listdir

DIR = "./Martyrologium1960"
months = ["_Jan_", "_Feb_", "_Mar_", "_Apr_", "_May_", "_Jun_", "_Jul_", "_Aug_",
        "_Sep_", "_Oct_", "_Nov_", "_Dec_"]

files = []

for f in listdir(DIR):
    if f.endswith(".txt"):
        with open(DIR + "/" + f, 'r', encoding = "ISO-8859-1") as file:
            data = file.read()
            data = data.split("\n_\n")
            header, paragraphs = data[0], data[1].split("\n")
            paragraphs = list(filter(lambda p: len(p) > 0, paragraphs))
        f = f.replace(".txt", "")
        f = f.split("-")
        m, d = f[0], f[1]
        files.append((m, d, header, paragraphs))

files.sort(key=lambda t: (t[0], t[1]))

out = ""

for m, d, hdr, pars in files:
    out += "\\martday{" + d + " " + months[int(m) - 1] + "}{" + hdr + "}\n\n"
    for p in pars:
        out += "\\martentry{" + p + "}\n\n"
    out += "\\endmartday\n\n"

with open("out.txt", 'w', encoding = "ISO-8859-1") as file:
    file.write(out)

print(out)