Управление: стрелки на клавиатуре и Enter, выход из программы — Esc

Исходник calc.py:

# -*- coding: utf-8 -*-
# kmsvsr.ru 2020-06-06

import msvcrt
from decimal import *

def makeDisplayString(s):
  result = " " * (20 - len(s)) + s
  return result

class MyCalculator:
  def __init__(self):
    self.last_result = Decimal('99999999999999999999.0')
    self.result = Decimal('0.0')
    self.display_default='''
=====Калькулятор==========
|[ 00000000000000000000 ]|
|========================|
|                        |
|[ 1 ] [ 2 ] [ 3 ]  [ + ]|
|                        |
|[ 4 ] [ 5 ] [ 6 ]  [ - ]|
|                        |
|[ 7 ] [ 8 ] [ 9 ]  [ x ]|
|                        |
|[ 0 ] [ . ] [ = ]  [ / ]|
|                        |
==========================
'''
    self.display = self.display_default
    self.keys=("123+", "456-", "789x", "0.=/")

    self.ACTION_EMPTY = 0
    self.ACTION_PLUS = 1
    self.ACTION_MINUS = 2
    self.ACTION_MULTIPLY = 3
    self.ACTION_DIVIDE = 4

    self.last_action = self.ACTION_EMPTY
    
    self.visible = 1
    
    self.display_digits = "0"  # цифры, которые видно на калькуляторе, не больше 20
    self.last_display_digits = ""
    self.updateDigitsOnDisplay()
    
    # положение курсора слева сверху
    self.curx=0
    self.cury=0
    
    self.needNewDigit = 0  # 1 после кнопки действия
    
  def updateKeysOnDisplay(self):
    self.display = self.display.replace('[ %s ]' % self.keys[self.cury][self.curx], '[>%s<]' % self.keys[self.cury][self.curx])

  def updateDigitsOnDisplay(self):
    if len(self.display_digits) > 0:
      self.display = self.display.replace('00000000000000000000', makeDisplayString(self.display_digits) )
    else:
      self.display = self.display.replace('00000000000000000000', makeDisplayString(self.last_display_digits) )
    
  def resetDisplay(self):
    self.display = self.display_default
    
  def show(self):
    self.visible = 1
    self.redraw()
    
  def redraw(self):
    self.resetDisplay()
    self.updateDigitsOnDisplay()
    self.updateKeysOnDisplay()
    if self.visible == 1:
      print(self.display)
      
  def calc(self):
    try:
      new_value = Decimal('%s' % self.display_digits)
    except:
      new_value = Decimal('99999999999999999999.0')
      
    if self.last_action == self.ACTION_PLUS:
      self.result = self.last_result + new_value
    if self.last_action == self.ACTION_MINUS:
      self.result = self.last_result - new_value
    if self.last_action == self.ACTION_MULTIPLY:
      self.result = self.last_result * new_value
    if self.last_action == self.ACTION_DIVIDE:
      self.result = self.last_result / new_value
    if self.last_action == self.ACTION_EMPTY:
      self.result = new_value
    if self.last_action != self.ACTION_EMPTY:
      self.display_digits = "%s" % self.result
    self.last_result = self.result
    self.needNewDigit = 1
    self.last_display_digits = self.display_digits
    
'''
 H
KPM
'''

calc = MyCalculator()

calc.show()

while True:
  if calc.needNewDigit == 1:
    calc.display_digits = ""
    calc.needNewDigit = 0
  lastkey = msvcrt.getch()
  #print(lastkey)
  if lastkey == b'\x1b':  # Esc
    break
  if lastkey == b'K':  # left
    if calc.curx > 0:
      calc.curx -= 1
    calc.updateKeysOnDisplay()
  if lastkey == b'P':  # down
    if calc.cury < 3:
      calc.cury += 1
    calc.updateKeysOnDisplay()
  if lastkey == b'M':  # right
    if calc.curx < 3:
      calc.curx += 1
    calc.updateKeysOnDisplay()
  if lastkey == b'H':  # up
    if calc.cury > 0:
      calc.cury -= 1
    calc.updateKeysOnDisplay()
  if lastkey == b'\r':
    #Разбираемся, какая кнопка нажата на калькуляторе
    selected = calc.keys[calc.cury][calc.curx]
    if calc.curx < 3 and calc.cury < 3:  # цифры больше 0
      newd = selected  # новая нажатая цифра
      if calc.display_digits == "0":
        calc.display_digits = newd
      elif len(calc.display_digits) < 20:
        calc.display_digits += newd
    if calc.curx == 0 and calc.cury == 3:  # 0
      if calc.display_digits != "0" and len(calc.display_digits) < 20:
        calc.display_digits += selected
    if calc.curx == 1 and calc.cury == 3:  # . (точка)
      if len(calc.display_digits) < 20 and '.' not in calc.display_digits:  
        calc.display_digits += selected
    #.needNewDigit  
    #.last_action
    if calc.curx == 3 and calc.cury == 0:  # +
      calc.calc()
      calc.last_action = calc.ACTION_PLUS
    if calc.curx == 3 and calc.cury == 1:  # -
      calc.calc()
      calc.last_action = calc.ACTION_MINUS
    if calc.curx == 3 and calc.cury == 2:  # x
      calc.calc()
      calc.last_action = calc.ACTION_MULTIPLY
    if calc.curx == 3 and calc.cury == 3:  # /
      calc.calc()
      calc.last_action = calc.ACTION_DIVIDE
    if calc.curx == 2 and calc.cury == 3:  # =
      calc.calc()
      calc.last_action = calc.ACTION_EMPTY

  print('\n'*25)
  calc.redraw()

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