[Tutor] class function problem

[Roelof Wobben]

HEllo, 
 
I have this exercise :
 
3.Rewrite the increment function so that it doesn’t contain any loops.
 
The increment function looks like this :
 
def increment(time, seconds):
    time.seconds = time.seconds + seconds
    while time.seconds>= 60:
        time.seconds = time.seconds - 60
        time.minutes = time.minutes + 1
    while time.minutes>= 60:
        time.minutes = time.minutes - 60
        time.hours = time.hours + 1

 
So I thought that recursion can do the job.
 
So I wrote this :
 
class tijd :
    pass
 
def incrememt_seconds(time): 
       time.seconds = time.seconds - 60 
       time.minutes =  time.minutes + 1 
       if time.seconds>= 60 :
           increment_seconds(time,seconds, minutes)
       return  time 
           
def increment_minutes(time):
    time.minutes = time.minutes - 60
    time.hours = time.hours + 1
    if time.minutes>= 60 :
        increment_minutes(time, minutes,hours)
    return time
 
def increment(time, seconds):
    time.seconds = time.seconds + seconds 
    if time.seconds>= 60 :
        increment_seconds(time)
    if time.minutes>= 60 :
        increment_minutes(time)
    return time
 
time = tijd()
time.hour = 20 
time.minutes = 20
time.seconds = 20 
seconds = 20
uitkomst = increment(time, seconds)
 
But how can i Check the outcome.
print uitkomst gives the object and print time(uitkomst) gives this error message :
 
Traceback (most recent call last):
  File "C:\Users\wobben\workspace\oefeningen\src\test.py", line 34, in <module>
    print time(uitkomst)
AttributeError: tijd instance has no __call__ method
 
Roelof