Classifies date formats and outputs them in standard format (day/month/year)

date_classifier.py

#Kopirajt LBLZR_ lmao
import os.path, codecs, sys

date_files = ["dates1.txt", "dates2.txt", "dates3.txt", "dates4.txt"]
output_file = "dates_out.txt"

def save_list(listt, filename):
	with codecs.open(filename, "w", "utf-8") as fp:
		#firstly we delete old entries
		fp.truncate()
		for item in listt:
  			fp.write("{}\r\n".format(item))

def load_list(filename):
	#check if exists
	if os.path.isfile(filename):
		with codecs.open(filename, "r", "utf-8") as fp:
			listt = fp.readlines()
			#remove whitespace characters at the end of each line
			listt = [x.strip() for x in listt]
			return listt
	return []

def process_dates(dates):
    print("Classifying date format")

    out_dates = []
    delimeters = ['.', '/']
    types = [0,0,0]
    type_string = ["unknown", "day", "month", "year"] # 1 = day, 2 = month, 3 = year

    for date in dates:
        for idx, s in enumerate(''.join([o if not o in delimeters else ' ' for o in list(date)]).split()):
            s = int(s)

            if(s <= 12):
                types[idx] = 2 #month
            elif(s <= 31):
                types[idx] = 1 #day
            else:
                types[idx] = 3 #year

        if sum(types) == 6:
            break
    
    print(f"Date format: {type_string[types[0]]}/{type_string[types[1]]}/{type_string[types[2]]}")
    print("Changing to standard format (day/month/year)...")

    # Create lookup table
    type_lookup = [0, 0, 0]
    for id, i in enumerate(types):
        if(i == 1):
            type_lookup[id] = 0
        if(i == 2):
            type_lookup[id] = 1
        if(i == 3):
            type_lookup[id] = 2

    print(f"Lookup table: {type_lookup}")

    for date in dates:
        split_date = ''.join([o if not o in delimeters else ' ' for o in list(date)]).split()
        out_dates.append(f"{int(split_date[type_lookup[0]])}/{int(split_date[type_lookup[1]])}/{int(split_date[type_lookup[2]])}")
    
    return out_dates

dates_out = []
for filename in date_files:
    print(f"Processing file {filename}")
    dates_out.extend(process_dates(load_list(filename)))

print(f"Saving dates to {output_file}")
save_list(dates_out, output_file)