text: #!/usr/bin/env python
  # -*- coding: UTF-8 -*-
  #
  # Copyright (c) 2016 ASMlover. All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions
  # are met:
  #
  #  * Redistributions of source code must retain the above copyright
  #    notice, this list ofconditions and the following disclaimer.
  #
  #  * Redistributions in binary form must reproduce the above copyright
  #    notice, this list of conditions and the following disclaimer in
  #    the documentation and/or other materialsprovided with the
  #    distribution.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  # FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  # POSSIBILITY OF SUCH DAMAGE.
  
  class Interpreter(object):
      def __init__(self):
          self.stack = []
  
      def _byte_load(self, value):
          self.stack.append(value)
  
      def _byte_print(self):
          value = self.stack.pop()
          print(value)
  
      def _byte_add(self):
          x = self.stack.pop()
          y = self.stack.pop()
          self.stack.append(x + y)
  
      def run_code(self, codes):
          instructions = codes['instructions']
          datas = codes['datas']
          for step in instructions:
              instruction, argument = step
              if instruction == 'load':
                  self._byte_load(datas[argument])
              elif instruction == 'add':
                  self._byte_add()
              elif instruction == 'print':
                  self._byte_print()
  
  def main():
      codes = {
          'instructions': [
              ('load', 0),
              ('load', 1),
              ('add', None),
              ('print', None)
          ],
          'datas': [7, 56]
      }
      vm = Interpreter()
      vm.run_code(codes)
  
  if __name__ == '__main__':
      main()
  