***PLEASE IGNORE THIS FILE***

calculator...
# renamed to calculator[1], from calcgui[12]
# rand->random
# () (X) -> get(), set(X)
# help comes from here now, not guimixin: added about box
# add PyCalc title in main window and cmdline popup
# make cmdline popup 40 wide
# use package imports for outside tools used
# add color/font config options
# add 'L' or long key to append L to curr entry
# add keyboard bindings or set focus on entry
#     prob with entry focus - '+' expr tyepd out, not eval'd auto
# add <Return> binding for cmd line popup
# add select + icursor for cmd line status msg
# add init cmdline with value in main entry on open (so can copy out)
# add cmdline result to 'okay' msg in cmd line, selected
# add Operators, Operands as class attrs for kbd use nd customization
# change beatsMe to afterMe
# L just append to text, don't erase (not for '.'-> may start next opnd)
# cmd line - label and button don't grow in resize now, only entry
# add 'hist' button and prev calc logs popup
#
# show calculator_test.py (embed, subclass)
# then calculator_plus_ext, calculator_plus_emb
#  - note that must pack2 subclass labels 1st, else calc buttons
#    on bottom, not subclass's label (pack order gives attach order)
#    updated: _test file adds a row of buttons in subclass--exploits fact
#    that eval/clear will apear at bottom, since packed before new
#    row, with side=bottom
#  - note that diff between container and subclass shows in location
#    of extra row (after for container, inside for subclass), and when
#    resized up (all gorw at same rate for subclass--one frame, but 
#    calc part and label and extra row grow proportionally for 
#    container, since 3 parts share enclosing container);
#
# exercise: add support for X ** Y type expressions (update afterMe
# table, add a button);  to extend Evaluator, could either change in
# place (sufficient for this app), or create a subclass and pass 
# instance into CalcGui class; as is, hardcoded in constructor, and
# must be in same module; could subclass CalcGui too, but more code?
#
# exercise: history is a modal popup dialog now; might be better to 
# make it a stay-up window which is updated while calcs are being
# performed.  This gets complicated by the fact that calculations 
# happen in the embedded Evaluator object, which doesn't currently
# handle any GUI operations.  Poss: hist = new object that wraps a
# ScrolledText, and packs/unpacks to display/hide itself.  Or, 
# attach to cal itself, not new toplevel window.
# should 'clear' button clear history list? (as is, empties list
# on next clear if it's already over 64 lines long--heuristic to 
# avoid letting it grow large enough to take significant space)
#
# note: could set title/bindings on parent instead of self.master,
# but may be None = default Tk() root; self.master is parent
# or Tk() -- whatever Tkinter linked calc gui to as parent
# could change to avoid self.master:
#        parent = parent or Tk()
#        if not isinstance(parent, Frame):
#            parent.title('PyCalc 2.0')               # title iff owns window
# same as:
#        if not parent or not isinstance(parent, Frame):
#            self.master.title('PyCalc 2.0')          # title iff owns window
# BUT, then get default empty window in addition to calcgui!
#
# ??? bind_all versus bind on toplevel -> movingpics and clock too
# either one works:
#           self.master.bind('<KeyPress>', self.onKeyboard)
#           self.bind_all('<KeyPress>', self.onKeyboard)
# BUT: if > 1 calculator in priocess, keypress in any winds up
# going to entry of last calc created!  AND would intercept and
# press elsewhere in large GUI (ex: presses in toplevel with 'quit'
# button in _plus2)  AND would override and 'all' bindings created
# by an enclosing GUI;  
#       -> use toplevel binding and enable and focus
# on entry if not a toplevel; ways to work around, but too complex
# (ex: assoc special tag with all widgets except entry, delete all
# or toplevel tag for entry, etc., butg typing into entry is odd
# anyhow--insert pos not auto updated on append--need to do manually
# in code if desired);
# 
# ???calculator_plusplus.py -- cmdline args for plus varients
#      -> fixed: getCalcArgs used in _plus and _plus2
#
# ??? key bindings make typing numbers into entry field directly
# impossible! - '1' is input to entry AND echoed again by binding;
# bindings are mutually exclusive with manual input in entry field?
# unbind for entry?  make entry a label instead?  read only?  
# keys on/off toggle?  cmd line popup is still available for arb 
# input lines
#       -> disabled entry if bind is used (see bind not above)
#          note: could just use a Label if disabled anyhow, but
#          linked var and entry lets prog update display by just
#          changing var (saves a step), and still a enabled entry
#          if key bindings not applied (not in a toplevel)