Counts all the hours from a horrific format

hour_count.py

from datetime import datetime

import re
# Splitting the lines


lines = []


format_string = "%d.%m.%Y";

hours = {}

def parseLines(start_date, end_date, lines):
    curDate = None
    curDateLines = []
    for line in lines:
        # Checking for indentation
        tabs = re.match(r'[ \t\n\r\f\v]', line)
        if tabs:
            #not a date
            curDateLines.append(line)
        else:
            if curDate is not None and curDate <= end_date and curDate >= start_date :
                parseLinesForDate(curDateLines)
            curDateLines = []
            curDate = datetime.strptime(line.strip().replace(":", ""), format_string);

    if curDate is not None and curDate <= end_date and curDate >= start_date:
        parseLinesForDate(curDateLines)



def parseLinesForDate(lines):
    for line in lines:
        parseLine(line)



def parseLine(line):
    substring = line.split(":");
    if len(substring) > 1:
        # It has an : so it is hours (can be description too, todo)
        hoursName = substring[0].strip().lower()
        additionHours = float(substring[1])
        curHours = hours.get(hoursName, 0)

        hours[hoursName] = curHours + additionHours
    else:
        #Its a discription
        pass



files = input("All files with commas inbetween: ")
if ',' in files:
    files = files.split(",")
else:
    files = [files]

for file in files:
    fp = open(file)
    for i, line in enumerate(fp.readlines()):
        lines.append(line)


start_date = input("Starting date(dd.mm.yyyy: ")
end_date = input("Ending date(dd.mm.yyyy: ")

start_date = datetime.strptime(start_date, format_string)
end_date = datetime.strptime(end_date, format_string)

parseLines(start_date, end_date, lines)

print(hours)