I have a simple program prints hour, minute and second. However, in line 6, the error message shows class Time() is not defined. I wonder why?

```
class Time(object):

    def print_time(time):
        print('%.2d:%.2d:%.2d' % (time.hour, time.minute, time.second))

    start = Time() #assign class Time to variable start

    start.hour = 9
    start.minute = 45
    start.second = 00

    Time.print_time(start) #classname.methodname(parameter)

```

Error message shows in line 6, class Time is not defined:

```
  File "C:\Program Files (x86)\Wing IDE 101 5.0\src\debug\tserver\_sandbox.py", line 1, in <module>
    # Used internally for debug sandbox under external interpreter
  File "C:\Program Files (x86)\Wing IDE 101 5.0\src\debug\tserver\_sandbox.py", line 6, in Time
builtins.NameError: name 'Time' is not defined

```