Tool to sum hours sheet at work

work.py

import time

print('SCHEDULE ENTRY', '='*50, sep='\n')
print('[Input schedule lines "HHMM <task>". Ends when <task> is "end"]\n')

sums = {}
last_start = None
t = lambda s: int(s[:2])*60*60 + int(s[2:4])*60 # HHMM to seconds since previous 00:00

while True:
	try:
		line = input()
	except EOFError:
		break
	if line == '':
		continue
	start, task = line.split(' ', 1)
	if last_start:
		sums[last_task] = t(start) - t(last_start) + sums.get(last_task, 0.0)
	last_start, last_task = start, task
	if task == 'end':
		break

print('\nSummary:',*[f'{seconds/(60*60)} {task}' for task, seconds in sums.items()], sep='\n')