#-*- coding:cp1251 -*-
from __future__ import division
from Tkinter import *
from tkMessageBox import showerror, askokcancel
from math import *

# ----цвета----
LIGHTGREY = '#6e6e6e'
GREY = '#303030'
BLACK = '#000000'
WHITE = '#ffffff'
ORANGE = '#ffb75f'
RED = '#ff0000'

def press(symbol): 
	entry.insert(END, str(symbol))
	
def copy(event=None):
	obj = entry.get()
	root.clipboard_clear()
	root.clipboard_append(obj)
	
def paste(event=None):
	entry.insert(END, root.clipboard_get())
	
def cut(event=None):
	obj = entry.get()
	root.clipboard_clear()
	root.clipboard_append(obj)
	entry.delete(0, END)

def func_input(function):
	if entry.get() == '':
		showerror(u'Ошибка', u'Сначала необходимо\nввести выражение.')
	else:
		entry.insert(0, function+'(')
		press(')')
		equal() # после вставки ф-ции результат сразу отображается

def backspace():
	expression = entry.get()
	entry.delete(0, END)
	entry.insert(END, expression[0:-1])

def c(event=None):
	sv.set('')
	entry.delete(0, END)
	
def up():
	result = sv.get()
	if result == '': 
		pass
	else:
		entry.delete(0, END)
		entry.insert(END, result)

def bye():
	if not askokcancel(u"Выход", u"Может еще что-нибудь посчитаем?"):
		root.destroy()
		
def equal(event=None):
	expression = entry.get()
	try: 
		result = eval(expression)
	except ZeroDivisionError:
		showerror(u'Ошибка', u'На ноль\nделить нельзя.')
		return
	except (SyntaxError, NameError), exc:
		_L = str(exc)
		showerror(u'Ошибка', _L[:-18])
		return
# --- блок для отбрасывания нуля у float, пример:  1.0 заменяется на 1 --
	if type(result) == type(0.0):
		if result == int(result): result = int(result)
# --- блок завершён ---
	result = str(result)
	sv.set(str(result))

root = Tk()
root.title("PyCalculator")
root.protocol("WM_DELETE_WINDOW", bye)
root.resizable(0, 0)
root.bind('<Escape>', exit)

sv = StringVar()
menu = Menu(root)
root.config(menu=menu)

filemenu = Menu(menu)
menu.add_cascade(label=u"Файл", menu=filemenu)
filemenu.add_command(label=u"Очистить    Ctrl+C", command=c)
filemenu.add_separator()
filemenu.add_command(label=u"Выход         Esc", command=exit)

inp_menu = Menu(menu)
menu.add_cascade(label=u"Вставка", menu=inp_menu)

for _func in ['DEGREES', 'RADIANS', 'SIN', 'COS', 'TAN', 'SQRT']:
	inp_menu.add_command(label=_func,
		command = (lambda func: lambda: func_input(func))(_func.lower()))

frame = Frame(root, background=ORANGE)
frame.pack()

entry = Entry(frame, text='', width=27, bg=RED, fg=BLACK, font=("Arial", 20, "bold"))
entry.bind('<Return>', equal)
entry.bind('<Control-c>', c)
entry.bind('<Control-ntilde>', c)  # для русской раскладки 'c'
entry.bind("<Button-3>", (lambda event: entrymenu.post(event.x_root, event.y_root)))
entry.grid(row=0, column=0, columnspan=6)

entrymenu = Menu(root, tearoff=0)
entrymenu.add_command(label=u"Вырезать всё", command=cut)
entrymenu.add_command(label=u"Копировать всё", command=copy)
entrymenu.add_command(label=u"Вставить", command=paste)

Label(frame, text=u'результат:', width=8, bg=ORANGE,
	font=("Arial", 14, "bold")).grid(row=1, column=0, columnspan=2)

Label(frame, textvariable=sv, width=25, bg=ORANGE, 
	font=("Arial", 12, "bold")).grid(row=1, column=2, columnspan=4)

# кнопки
btns = []
input_btns = range(10) + ['.']
cmd_btns = ['+', '-', '*', '/', '(', ')', 'Back', 'C', 'Up', '=']
for symbol in input_btns + cmd_btns:
	btns.append(Button(frame,
			text = str(symbol),
			borderwidth = 6,
			width = 3,
			foreground = WHITE,
			activeforeground = WHITE,
			background = GREY,
			activebackground = GREY,
			font = ('Comic Sans MS', 17, 'bold'), 
			command = (lambda s: lambda: press(s))(symbol))) # жесть

btns[0]['width'] = 8
btns[11]['height'] = 3
btns[18]['command'] = c
btns[17].config(width=8, command=backspace)
btns[19]['command'] = up
btns[20]['command'] = equal

for i in range(11): 
	btns[i].config(background = LIGHTGREY,
				activebackground = LIGHTGREY)
				
btns[0].grid(row=5, column=0, columnspan=2, pady=2)
btns[1].grid(row=4, column=0, pady=2)
btns[2].grid(row=4, column=1)
btns[3].grid(row=4, column=2)
btns[4].grid(row=3, column=0, pady=2)
btns[5].grid(row=3, column=1)
btns[6].grid(row=3, column=2)
btns[7].grid(row=2, column=0, pady=2)
btns[8].grid(row=2, column=1)
btns[9].grid(row=2, column=2)
btns[10].grid(row=5, column=2)                       # точка

btns[11].grid(row=4, column=3, rowspan=2)            # +
btns[12].grid(row=5, column=4)                       # -
btns[13].grid(row=3, column=3)                       # *
btns[14].grid(row=3, column=4)                       # /
btns[15].grid(row=4, column=4)                       # (
btns[16].grid(row=4, column=5)                       # )
btns[17].grid(row=2, column=3, columnspan=2)         # Back
btns[18].grid(row=2, column=5)                       # С
btns[19].grid(row=3, column=5)                       # Up
btns[20].grid(row=5, column=5)                       # =

root.mainloop()