我定义了一个函数，询问你一天中什么时候开始工作，以及一个函数询问你什么时候结束工作。我现在正试图定义一个函数来计算它们之间的时间差，而我遇到的问题实际上是使用调用启动/完成函数的结果。
我很难理解如何使函数返回我想要的值，即当我调用函数并添加Monday参数时，从而询问具体在星期一开始工作的时间。我不知道如何获得类似"10:00"的结果，所以我可以在另一个函数中使用结果返回。
此外，我写这段代码的时间越长，就越不知道如何区分日子。在中，我创建了一个函数，询问你什么时候开始，然后我将其与另一个函数相结合，该函数基本上在一周中的几天内循环。我意识到我不知道如何将周一的ask_start_time函数与周四的ask_start_time函数分开。
我得到的错误是：
What time did you start on Monday?10:00
Traceback (most recent call last):
File "C:/Users/MM/PycharmProjects/pythonProject2/test.py", line 49, in <module>
start_datetime = datetime.datetime.strptime(mon, '%H:%M')
TypeError: strptime() argument 1 must be str, not None
代码：
for a in range(attempts):
start = input(f'What time did you start on {day_name}?')
validation = re.match("^([0-1]?[0-9]|2[0-3]):[0-5][0-9]$", start)
if validation:
break
print('Please use a HH:MM format only.')
else:
print('25 wrong attempts and you still don't understand that it's HH:MM?!')
def ask_finish_time(day_name, attempts=25):
for a in range(attempts):
finish = input(f'What time did you finish on {day_name}?')
validation = re.match("^([0-1]?[0-9]|2[0-3]):[0-5][0-9]$", finish)
if validation:
break
print('Please use a HH:MM format only.')
def days():
work_days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
start_times = {day: ask_start_time for day in work_days}
print(start_times)
def time_diff(a, b):
return b - a
ask_start_time('Monday')
start_datetime = datetime.datetime.strptime(ask_start_time, '%H:%M')
ask_finish_time('Monday')
finish_datetime = datetime.datetime.strptime(ask_finish_time, '%H:%M')
print(time_diff(start_datetime, finish_datetime))
def ask_start_time(day_name, attempts=25):
for a in range(attempts):
start = input(f'What time did you start on {day_name}?')
validation = re.match("^([0-1]?[0-9]|2[0-3]):[0-5][0-9]$", start)
if validation:
return start
print('Please use a HH:MM format only.')
else:
print('25 wrong attempts and you still don't understand that it's HH:MM?!')
def ask_finish_time(day_name, attempts=25):
for a in range(attempts):
finish = input(f'What time did you finish on {day_name}?')
validation = re.match("^([0-1]?[0-9]|2[0-3]):[0-5][0-9]$", finish)
if validation:
return finish
print('Please use a HH:MM format only.')
def days():
work_days = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"]
start_times = {day: ask_start_time for day in work_days}
print(start_times)
def time_diff(a, b):
return b - a
start = ask_start_time('Monday')
start_datetime = datetime.datetime.strptime(start, '%H:%M')
finish = ask_finish_time('Monday')
finish_datetime = datetime.datetime.strptime(finish, '%H:%M')
print(time_diff(start_datetime, finish_datetime))
问题是ask_start_time和ask_finish_time不返回任何结果，或者None。从这些函数返回解析的时间，您的代码就可以工作了。
def ask_start/end_time(...):
...
return start/finish