Example Python program waydrn15 (1).py

Modules

• import sys, os, Tkinter, time, random

• and configure Tk widgets (unless you import a zillion names into

Classes

• class TkinterWrapper:

Methods

• def init(self, underlying_widget):
• def getattr(self, name):
• def _attach_subwidget_method(name):
• def subwidget_method(self, args, *kwargs):
• def Tk(args, *kwargs):
• def Toplevel(args, *kwargs):
• def pack(args, *kwargs):
• def append_to_file(filename, astring):
• def log_to_file(filename, formatted_time, entry, window):
• def ask_what_you_are_doing(mainwin, filename):
• def schedule_question(mainwin, filename):
• def main(argv):

Code

Python tkinter example

#!/usr/bin/python
# -*- coding: utf-8; -*-
"""Asks, "What are you doing right now?" at random, averaging every 15 minutes.

Results are appended to `~/waydrn15.log` by default.

"""

import sys, os, Tkinter, time, random


### Tkinter interface

# This is because Tkinter makes it unnecessarily difficult to create
# and configure Tk widgets (unless you import a zillion names into
# your own namespace).

class TkinterWrapper:
    "Simple wrapper to make it easier to create Tk subwidgets."

    def __init__(self, underlying_widget):
        self.underlying_widget = underlying_widget

    def __getattr__(self, name):
        return getattr(self.underlying_widget, name)

def _attach_subwidget_method(name):
    widget_class = getattr(Tkinter, name)
    def subwidget_method(self, *args, **kwargs):
        return widget_class(self.underlying_widget, *args, **kwargs)
    setattr(TkinterWrapper, name, subwidget_method)

for widget_class_name in 'Label Entry Button'.split():
    _attach_subwidget_method(widget_class_name)


def Tk(*args, **kwargs):
    return TkinterWrapper(Tkinter.Tk(*args, **kwargs))
def Toplevel(*args, **kwargs):
    return TkinterWrapper(Tkinter.Toplevel(*args, **kwargs))

def pack(*args, **kwargs):
    for widget in args:
        widget.pack(**kwargs)


### Application code

def append_to_file(filename, astring):
    f = open(filename, 'a')

    try:
        f.write(astring)
    finally:
        f.close()


def log_to_file(filename, formatted_time, entry, window):
    message = entry.get().encode('utf-8')
    append_to_file(filename, '%s %s\n' % (formatted_time, message))
    window.destroy()

def ask_what_you_are_doing(mainwin, filename):
    new_window = Toplevel()

    entry = new_window.Entry(width=80)

    now = time.localtime(time.time())
    datetime = time.strftime('%Y-%m-%d %H:%M', now)
    command = lambda: log_to_file(filename, datetime, entry, new_window)
    button = new_window.Button(text='Log it', command=command)
    button.bind('<Return>', lambda ev: button.invoke())

    text = 'What are you doing right now? (%s)' % time.strftime('%H:%M', now)
    pack(new_window.Label(text=text), entry, button)

    entry.focus()
    new_window.lift()      # raise above other windows, stealing focus

    schedule_question(mainwin, filename)

def schedule_question(mainwin, filename):
    seconds = random.expovariate(1.0/(15*60))
    # for debugging: seconds = 5
    mainwin.after(int(1000 * seconds),
                  lambda: ask_what_you_are_doing(mainwin, filename))

def main(argv):
    if len(argv) == 2:
        filename = argv[1]
    else:
        filename = os.path.join(os.environ['HOME'], 'waydrn15.log')

    mainwin = Tk()
    mainwin.title('time sampling applet')
    pack(mainwin.Label(text='Close this window to stop logging your time.'),
         mainwin.Label(text='Logging to %r.' % filename))

    schedule_question(mainwin, filename)

    mainwin.mainloop()

if __name__ == '__main__':
    main(sys.argv)

# Local Variables:
# compile-command: "./waydrn15.py"
# End:

Useful Links

• Articles: https://python-commandments.org/
• Python shell: https://bsdnerds.org/learn-python/
• Tutorial: https://pythonprogramminglanguage.com/