[PYTHON] TypeError: unsupported operand type (s) for-: What to do when'datetime.time'and'datetime.time'

--Environment --macOS Catalina version 10.15.7 - Python 3.8.5 - pandas 1.1.3

Event: TypeError: unsupported operand type (s) for-:'datetime.time' and'datetime.time'

I got angry when I subtracted the time

Traceback (most recent call last):
  File "/Users/mananakai/tryPython/main.py", line 30, in calc_diff
    diff = end - start
TypeError: unsupported operand type(s) for -: 'datetime.time' and 'datetime.time'

def calc_diff(start, end):
    diff = end - start
    print(diff)

Cause: datetime.time and datetime.date cannot be calculated as is

-[python] datetime.time type to add and subtract time

It cannot be calculated only by time information (datetime.time) and date information (datetime.date). Date and time information (datetime.datetime) is used for the calculation.

Correspondence: Convert to datetime.datetime and calculate

The calculation result is the difference information between times (datetime.timedelta).

def calc_diff(start, end):
    today = datetime.date.today()
    d_start = datetime.datetime.combine(today, start)
    d_end = datetime.datetime.combine(today, end)
    diff = d_end - d_start
    print(type(diff)) # >> <class 'datetime.timedelta'>