Counting appearances of Hannibal Lecter in films the easy way

hannibal2.py

import sys
import time
import json
import datetime
from termcolor import colored

print('Hannibal Lecter appearance counter')
title = input('Please enter the film title: ')

occurrences = []
recording = False
current_start_time = ''

def start_recording(start_time):
    global recording
    global current_start_time
    current_start_time = start_time.rstrip()
    print(colored('Recorded start time as %s.' % current_start_time, 'blue'))
    print('Type in the scene end time to finish.')
    recording = True

def stop_recording(end_time):
    global recording
    global current_start_time
    time_total = calculate_ocurrence_legth(current_start_time, end_time)
    save_occurrence_of_length(time_total)
    recording = False

def calculate_ocurrence_legth(start_time, end_time):
    start_time = convert_time_to_datetime(start_time)
    end_time = convert_time_to_datetime(end_time)
    time_total = end_time - start_time
    print(colored('Scene length recorded as %s.' % time_total, 'green'))
    return time_total.total_seconds()

def convert_time_to_struct(given_time):
    return time.strptime('2014-04-07 ' + given_time.rstrip(), "%Y-%m-%d %M:%S")

def convert_time_to_datetime(given_time):
    return datetime.datetime.fromtimestamp(time.mktime(convert_time_to_struct(given_time)))

def save_occurrence_of_length(length):
    occurrences.append(length)

def error_message():
    if recording:
      print(colored('Sorry, you need to add scene finish time first.', 'red'))
    else:
      print(colored('Sorry, didn\'t understand that. Add start time or type \'the end\' to finish.'))

def finish():
    total = sum(occurrences)
    count = len(occurrences)
    print_to_file(total, count, occurrences)
    print('Tallying up the results!')
    print("Registered %(count)s occurrences, totalling %(total)s seconds." % locals())
    sys.exit()

def print_to_file(total, count, items):
    f = open(title_to_filename(title), 'a')
    json.dump({'total': total, 'count': count, 'items': items}, f, indent=2)
    f.close()

def title_to_filename(title):
    title = title.replace(' ', '_')
    date = datetime.datetime.now().strftime("%Y%m%d%H%M%S")
    filename = "%(title)s_%(date)s.txt" % locals()
    return filename

print('Type in the scene start time to begin. Type \'the end\' when done.')
for line in sys.stdin:
    if line == 'the end\n':
        if recording:
            error_message()
        else:
            finish()
    else:
        if recording:
            stop_recording(line)
        else:
            start_recording(line)