self.entry = entry(self, TOP, self.text) # font, color configurable
self.entry.config(font=font) # 3.0: make display larger
self.entry.config(justify=RIGHT) # 3.0: on right, not left
for row in self.Operands:
frm = frame(self, TOP)
for char in row:
button(frm, LEFT, char,
lambda op=char: self.onOperand(op),
fg=fg, bg=bg, font=font)
frm = frame(self, TOP)
for char in self.Operators:
button(frm, LEFT, char,
lambda op=char: self.onOperator(op),
fg=bg, bg=fg, font=font)
frm = frame(self, TOP)
button(frm, LEFT, 'dot ', lambda: self.onOperand('.'))
button(frm, LEFT, ' E+ ', lambda: self.text.set(self.text.get()+'E+'))
button(frm, LEFT, ' E- ', lambda: self.text.set(self.text.get()+'E-'))
button(frm, LEFT, 'cmd ', self.onMakeCmdline)
button(frm, LEFT, 'help', self.help)
button(frm, LEFT, 'quit', self.quit) # from guimixin
frm = frame(self, BOTTOM)
button(frm, LEFT, 'eval ', self.onEval)
button(frm, LEFT, 'hist ', self.onHist)
button(frm, LEFT, 'clear', self.onClear)
def onClear(self):
self.eval.clear()
self.text.set('0')
self.erase = 1
def onEval(self):
self.eval.shiftOpnd(self.text.get()) # last or only opnd
self.eval.closeall() # apply all optrs left
self.text.set(self.eval.popOpnd()) # need to pop: optr next?
self.erase = 1
def onOperand(self, char):
if char == '(':
self.eval.open()
self.text.set('(') # clear text next
self.erase = 1
elif char == ')':
self.eval.shiftOpnd(self.text.get()) # last or only nested opnd
self.eval.close() # pop here too: optr next?
self.text.set(self.eval.popOpnd())
self.erase = 1
else:
if self.erase:
self.text.set(char) # clears last value
else:
self.text.set(self.text.get() + char) # else append to opnd
PyCalc: A Calculator Program/Object | 1471