counter class

Write a generic Counter class with these methods. The counter should start at 0 and go up to the maximum value, then reset to 0 and start counting up again.

constructor that takes a maximum value. What data needs to be stored in every counter object?
```
__init__(self, maxval)
```
str method, in case someone tries to print a counter object
```
__str__(self)
```
getter, for current value of counter
```
getValue(self)
```
setter, to set or reset value:
```
setValue(self, v)
```
increment, to increase value by 1, rollover back to zero if needed
```
increment(self)
```

Test your Counter class with something simple like this:

    c = Counter(23)
    for i in range(60):
      print c
      c.increment()

(should print 0, 1, 2, ... 23, 0, 1, 2...)

clock class

Write a clock class with these methods. Note: make use of the Counter() class!

Also note: no graphics in this class...this is just a simple clock object.

constructor that takes current time of clock. What data needs to be stored in every Clock object?
```
__init__(self, hr, mn, sc)
```
Hint: you should use 3 Counter objects!
str method to allow printing of Clock objects
```
__str__(self)
```
getTime(), to get/return a string representation of the time:
```
getTime(self)
```
setClock(), to allow setting the time (we will not use this today, but probably a useful method to have in a clock class):
```
setClock(self, h, m, s)
```
tick(), to advance time of clock by 1 second:
```
tick(self)
```

Again, add a simple test to make sure the clock class works:

    c = Clock(11,58,45)
    for i in range(130):
      print c
      c.tick()

Should print out:

digital clock app

Now run the digital clock app, which imports the Clock class:

from graphics import *
from clock import *
from time import sleep
import datetime

##########################################################

def main():
    """create graphics/digital clock app for desktop"""

    w = 300
    h = 100
    gw = GraphWin("digiclock", w, h)
    gw.setBackground("grey15")
    color = color_rgb(239,145,4)
    cp = Point(w/2, h/2)

    # use datetime module to get current hour, min, sec
    now = datetime.datetime.now()
    h = now.hour
    m = now.minute
    s = now.second
    # create clock object and clock text object
    digclock = Clock(h,m,s)
    clockTextObj = Text(cp, digclock.getTime())
    clockTextObj.setSize(36)
    clockTextObj.setFace("times roman")
    clockTextObj.setTextColor(color)
    clockTextObj.draw(gw)

    # go into getTime mode...
    while True:
      sleep(1)
      digclock.tick()
      clockTextObj.setText(digclock.getTime())
      key = gw.checkKey()
      if key == 'Escape': 
          break


##########################################################
main()