The exercise for Pmw.EntryField.

Pmw.EntryField.py

from Tkinter import *
import time, string

import Pmw

class EntryValidation:
	def __init__(self, master):
		now = time.localtime(time.time())
		self._date = Pmw.EntryField(master, labelpos='w', label_text='Date (mm/dd/yy):', value = "%d%d%d" % (now[1], now[2], now[0]),
									validate={'validator':'date', 'format':'mdy', 'separator':'/'})
		self._time = Pmw.EntryField(master, labelpos='w', label_text='Time (24hr clock):', value='8:00:00',
									validate={'validator':'time', 'min':"00:00:00", 'max':'23:59:59', 'minstrict':0, 'maxstrict':0})
		self._real = Pmw.EntryField(master, labelpos='w', label_text='Real (50.0 to 1099.0):', value='127.2',
									validate={'validator':'real', 'min':"50", 'max':'1099', 'minstrict':0}, modifiedcommand = self.valueChanged)

		self._ssn = Pmw.EntryField(master, labelpos='w', label_text='Social Security #:', validate = self.validateSSN, value='')
		fields = [self._date, self._time, self._real, self._ssn]
		for field in fields:
			field.pack(fill='x', expand=1, padx=12, pady=8)
		Pmw.alignlabels(fields)
		self._date.component('entry').focus_get()

	def valueChanged(self):
		print 'Value changed, value is', self._real.get()
		
	def validateSSN(self, contents):
		result = -1
		if '-' in contents:
			ssnf = string.split(contents, '-')
			try:
				if len(ssnf[0]) == 3 and len(ssnf[1]) == 2 and len(ssf[2]) == 4:
					result = 1
			except IndexError:
				result = -1
		elif len(contents) == 9:
			result = -1
		return result

if __name__ == '__main__':
	root = Tk()
	root.option_add('*Font', 'Verdana 10 bold')
	root.option_add('*EntryField.Entry.Font', 'Courier 10')
	root.option_add('*EntryField.errorbackground', 'yellow')
	Pmw.initialise(root, useTkOptionDb=1)

	root.title('Pmw EntryField Validation')
	quit = Button(root, text='Quit', command=root.destroy)
	quit.pack(side='bottom')
	top = EntryValidation(root)
	root.mainloop()