ggg.py

from ftplib import FTP
from configparser import ConfigParser

src = r"the path to your credentials and hostname"

config = ConfigParser()
config.read(src)
host = config["FTP"]["host"]
username = config["FTP"]["username"]
password = config["FTP"]["password"]

# Connect and list contents.
ftp = FTP(host=host)
ftp.login(user=username, passwd=password)
list_cont = ftp.nlst()

# The below will create a list form list_cont only containing the items we are concerned with.
# This is so that we can then sort the new list and always download the most recent item.
substr = "part of filename to filter for"
final_list = list(filter(lambda s: substr in s, list_cont))
final_list.sort()
file_to_get = final_list[-1]

# Download happens here:
def grab_file(fname):
    print(f"Downloading {fname}")
    ftp.retrbinary("RETR " + fname, open(fname, "wb").write, 2400)
    print(f"Successfully downloaded {fname}")
    ftp.quit()


grab_file(file_to_get)