Intermediate Python

intermediate_python_closures2.py

def office_hours(start_time, finish_time):
    s = start_time
    f = finish_time
    
    def cal_working_hours():
        return ('Hi '+ '! Your office hours will be ' + str((int(f.split(':')[0]) - int(s.split(':')[0])))+ 
              ' hours.')
    
    ## returning the function but without () 
    return cal_working_hours
  
 
## Here it will return only function name because () or execution of function didn't happen.
cal_hours = office_hours('10:00','18:00')
cal_hours

#[Output]:
#<function __main__.office_hours.<locals>.cal_working_hours()>

## How to check the name of the funtion
print(cal_hours.__name__)

#[Output]:
#'cal_working_hours'

""" Now on that variable using "()" will be able to execute the function 
See here this cal_working_hours defined inside the office_hours function, and using the variables passed 
into the office hours still this cal_working_hours able to execute beacuse of closures """

print(cal_hours())

#[Output]:
#'Hi ! Your office hours will be 8 hours.'