# Coding styles...

from Tkinter import *
def cb(): print 'Hello'              

Button(None, {'text':'press', 'command':cb, Pack:{'side':'left'}}).mainloop()

Button(None, {Pack:{'side':LEFT}}, text='press', command=cb).mainloop()

widget = Button(None, text='press', command=cb)
widget.pack(side=LEFT)
widget.mainloop()

Button(None, text='press', command=cb).pack(side=LEFT)
mainloop()

root = Tk()
Button(root, text='press', command=cb).pack(side=LEFT)
root.mainloop() 

# Setting config options...

widget = Button()
widget.config(text='press', command=cb) 
widget.pack(side=LEFT)
widget.mainloop()

widget = Button()
widget['text'] = 'press' 
widget['command'] = cb
widget.pack(side=LEFT)
widget.mainloop()


#snip...
#
#FAILS ->
#   Label(None, Pack={}, text='Hello').mainloop()
# 	Pack is passed as a "-Pack" option name to Tk 'config'
#	Keyword arg names not evaluated => string keys in passed dict
#	only config values are eval'd (and are def'd in Tkconstants.py)
#
#FAILS ->
#   Label(None, {Pack:{}}, 'text'='hello').mainloop()
#   	syntax error: keyword can't be an expression 
#
#FAILS ->
#   Label(None, text='Hello', {Pack:{}}).mainloop()
#	syntax error: non-keyword arg after keyword arg
#
#FAILS ->
#   Label(None, text='Hello').pack().mainloop()
#	pack doesn't return the widget (None)
#
#FAILS ->
#   widget = Label(None, text='Hello')
#   widget.mainloop()
#	must be packed before it shows up: get an empty box
#
#   widget = Label(None, text='Hello')                 - kw's, pack called
#   widget.pack()
#	must call mainloop() to make widgets appear
#