Enviado em 03/08/2016 - 23:24h
Caculadora nao aceita comndos de teclado nem andar com tab para digitar na caixa de entrada
#Simple calculator app with a GUI front end, as per the "Python Challenge".
#Written in __exactly__ 1 hour.
#By Jesse Weinstein-jessw@loop.com
#Released on June 24, 2001, at 2:42 PM, Pacific Standard Time
from Tkinter import *
class Calculator:
def __init__(self, font_size=12):
self.font_size=font_size
self.make_window()
def make_window(self):
self.root=Tk()
self.root.title('Calculadora')
self.opersF=Frame(self.root)
self.opers=[]
for item in ['+', '-', '*', '/']:
self.opers.append(Button(self.opersF, text=item[0],\
height=1, width=2,\
font=('', `self.font_size`, '')))
self.opers[-1].bind('<1>', self.buttonCB)
self.opers[-1].pack(side=TOP)
self.display=Entry(self.root, font=('', `self.font_size`, ''),\
state=DISABLED, width=2)
self.numsF=Frame(self.root)
self.nums=[]
for item in range(1, 10):
self.nums.append(Button(self.numsF, text=`item`,\
height=1, width=2, \
font=('', `self.font_size`, '')))
self.nums[-1].bind('<1>', self.buttonCB)
self.nums[-1].grid(column=(item-1) % 3, row=(item-1)/3)
self.othersF=Frame(self.root)
self.others=[]
for item in [('=', self.equals), ('C', self.clear),\
('d', self.backspace)]:
self.others.append(Button(self.othersF, text=item[0],\
command=item[1], height=1, width=2,
font=('', `self.font_size`, '')))
self.others[-1].pack(side=RIGHT)
self.display.grid(column=0, row=0, columnspan=4, sticky=NW+E)
self.opersF.grid(column=3, row=1, rowspan=2, sticky=W)
self.numsF.grid(column=0, row=1, columnspan=3, sticky=SE)
self.othersF.grid(column=2, row=2, sticky=NE)
def buttonCB(self, event):
val=event.widget.cget('text')
self.display.config(state=NORMAL)
self.display.insert(END, val)
self.display.config(state=DISABLED)
def equals(self):
if self.display.get():
ans=eval(self.display.get())
self.display.config(state=NORMAL)
self.display.delete(0, END)
self.display.insert(0, ans)
self.display.config(state=DISABLED)
def clear(self):
self.display.config(state=NORMAL)
self.display.delete(0, END)
self.display.config(state=DISABLED)
def backspace(self):
self.display.config(state=NORMAL)
self.display.delete(len(self.display.get())-1)
self.display.config(state=DISABLED)
if __name__=='__main__':
it=Calculator()
print """If you are seeing this message because nothing else has appeared
on your screen, then I suggest you run this from IDLE, or uncomment out the line
directly below this one, which starts a Tkinter mainloop. (If you start a
mainloop in IDLE, it locks up.)"""
it.root.mainloop()
#Note: the above should be uncommented if running outside of IDLE
