code: def execute(source, optimize=True, output=sys.stdout, input=sys.stdin, steps=-1):
      
      from crianza import compiler
      code = compiler.compile(parser.parse(source), optimize=optimize)
      machine = Machine(code, output=output, input=input)
      return machine.run(steps)
docs: Compiles and runs program, returning the machine used to execute the
      code.
  
      Args:
          optimize: Whether to optimize the code after parsing it.
          output: Stream which program can write output to.
          input: Stream which program can read input from.
          steps: An optional maximum number of instructions to execute on the
              virtual machine.  Set to -1 for no limit.
  
      Returns:
          A Machine instance.