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calculator.py
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calculator.py
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from tkinter import *
class Calculadora:
def __init__(self):
self.dot = True
self.error = False
self.root = Tk()
self.config_window()
self.create_screen()
self.create_buttons()
self.root.mainloop()
def config_window(self):
self.root.title("Calculadora")
self.root.geometry("400x500")
self.screen_frame = Frame(self.root, bg='#2c2c2c')
self.screen_frame.place(relx=0, rely=0, relwidth=1, relheight=0.23)
self.button_frame = Frame(self.root)
self.button_frame.place(relx=0.001, rely=0.23, relwidth=0.999, relheight=0.77)
def create_screen(self):
#The label that shows the results
self.equation = ''
self.eqvar = StringVar()
self.eqvar.set(self.equation)
self.result_frame = Frame(self.screen_frame, bg='#2c2c2c')
self.result_frame.place(relx=0, rely=0.5, relwidth=1, relheight=0.5)
self.result_label = Label(self.result_frame, textvariable=self.eqvar,
bg='#2c2c2c', fg='#ffffff', font=(None, 18), anchor="e")
self.result_label.pack(side = RIGHT, padx=20, pady=(20, 10))
#Lastequation
self.lastvar = StringVar()
self.lastvar.set('')
self.lasteq_frame = Frame(self.screen_frame, bg='#2c2c2c')
self.lasteq_frame.place(relx=0, rely=0, relwidth=1, relheight=0.5)
self.lasteq_label = Label(self.lasteq_frame, textvariable=self.lastvar,
bg='#2c2c2c', fg='#777777', font=(None, 18), anchor="e")
self.lasteq_label.pack(side = RIGHT, padx=20, pady=(30, 0))
def create_buttons(self):
# Row 1
self.bac = Button(self.button_frame, text='C', command=self.clean)
self.bac.place(relx=0, rely=0, relwidth=0.5, relheight=0.2)
self.berase = Button(self.button_frame, text='⌫', command=self.erase)
self.berase.place(relx=0.5, rely=0, relwidth=0.25, relheight=0.2)
self.bdivision = Button(self.button_frame, text='/', command=lambda: self.operator(' / '))
self.bdivision.place(relx=0.75, rely=0, relwidth=0.25, relheight=0.2)
# Row 2
self.b7 = Button(self.button_frame, text='7', command=lambda: self.put_symbol('7'))
self.b7.place(relx=0, rely=0.2, relwidth=0.25, relheight=0.2)
self.b8 = Button(self.button_frame, text='8', command=lambda: self.put_symbol('8'))
self.b8.place(relx=0.25, rely=0.2, relwidth=0.25, relheight=0.2)
self.b9 = Button(self.button_frame, text='9', command=lambda: self.put_symbol('9'))
self.b9.place(relx=0.5, rely=0.2, relwidth=0.25, relheight=0.2)
self.bmulti = Button(self.button_frame, text='*', command=lambda: self.operator(' * '))
self.bmulti.place(relx=0.75, rely=0.2, relwidth=0.25, relheight=0.2)
# Row 3
self.b4 = Button(self.button_frame, text='4', command=lambda: self.put_symbol('4'))
self.b4.place(relx=0, rely=0.4, relwidth=0.25, relheight=0.2)
self.b5 = Button(self.button_frame, text='5', command=lambda: self.put_symbol('5'))
self.b5.place(relx=0.25, rely=0.4, relwidth=0.25, relheight=0.2)
self.b6 = Button(self.button_frame, text='6', command=lambda: self.put_symbol('6'))
self.b6.place(relx=0.5, rely=0.4, relwidth=0.25, relheight=0.2)
self.bsub = Button(self.button_frame, text='-', command=lambda: self.operator(' - '))
self.bsub.place(relx=0.75, rely=0.4, relwidth=0.25, relheight=0.2)
#Row 4
self.b1 = Button(self.button_frame, text='1', command=lambda: self.put_symbol('1'))
self.b1.place(relx=0, rely=0.6, relwidth=0.25, relheight=0.2)
self.b2 = Button(self.button_frame, text='2', command=lambda: self.put_symbol('2'))
self.b2.place(relx=0.25, rely=0.6, relwidth=0.25, relheight=0.2)
self.b3 = Button(self.button_frame, text='3', command=lambda: self.put_symbol('3'))
self.b3.place(relx=0.5, rely=0.6, relwidth=0.25, relheight=0.2)
self.bplus = Button(self.button_frame, text='+', command=lambda: self.operator(' + '))
self.bplus.place(relx=0.75, rely=0.6, relwidth=0.25, relheight=0.2)
#Row 5 - last one
self.b0 = Button(self.button_frame, text='0', command=lambda: self.put_symbol('0'))
self.b0.place(relx=0, rely=0.8, relwidth=0.5, relheight=0.2)
self.bdot = Button(self.button_frame, text='.', command=self.put_dot)
self.bdot.place(relx=0.5, rely=0.8, relwidth=0.25, relheight=0.2)
self.bequal = Button(self.button_frame, text='=', command=self.equal)
self.bequal.place(relx=0.75, rely=0.8, relwidth=0.25, relheight=0.2)
#updates the screen that shows the results and equations
def update_screen(self):
self.eqvar.set(self.equation)
#put a symbol at the screen
def put_symbol(self, symbol):
if(not self.error):
self.equation = self.equation + symbol
self.update_screen()
def operator(self, symbol):
if(not self.error):
self.dot = True
self.put_symbol(symbol)
def put_dot(self):
if(not self.error):
if(self.dot):
self.put_symbol('.')
self.dot = False
def erase(self):
if(len(self.equation) > 0):
if(not self.error):
if self.equation[-1] == '.':
self.dot = True
self.equation = self.equation[:-1]
self.update_screen()
def clean(self):
self.equation = ''
self.error = False
self.dot = True
self.lastvar.set('')
self.update_screen()
def equal(self):
eq = self.equation
if(not self.error):
if(self.equation == ''):
self.equation = '0'
else:
new_list = []
for e in self.equation.split():
a = e.lstrip('0')
if a == '':
new_list.append('0')
else:
new_list.append(a)
try:
self.equation = str(eval(''.join(new_list)))
except ZeroDivisionError:
if(not self.error):
self.equation = 'Divisão por zero'
self.error = True
except SyntaxError:
if(not self.error):
self.equation = 'Expressão mal escrita'
self.error = True
finally:
self.lastvar.set(eq)
if ('.' in self.equation):
self.dot = False
self.update_screen()
Calculadora()