old_contents: # -*- coding: utf-8 -*-
  
  from os.path import dirname, join
  
  from .evaluator import evaluate
  from .parser import parse, unparse, parse_multiple
  from .types import Environment
  
  
  def interpret(source, env=None):
      """
      Interpret a DIY Lang program statement
  
      Accepts a program statement as a string, interprets it, and then
      returns the resulting DIY Lang expression as string.
      """
      if env is None:
          env = Environment()
  
      return unparse(evaluate(parse(source), env))
  
  
  def interpret_file(filename, env=None):
      """
      Interpret a DIY Lang file
  
      Accepts the name of a DIY Lang file containing a series of statements.
      Returns the value of the last expression of the file.
      """
      if env is None:
          env = Environment()
  
      with open(filename, 'r') as sourcefile:
          source = "".join(sourcefile.readlines())
  
      asts = parse_multiple(source)
      results = [evaluate(ast, env) for ast in asts]
      return unparse(results[-1])
  
new_contents: # -*- coding: utf-8 -*-
  
  from .evaluator import evaluate
  from .parser import parse, unparse, parse_multiple
  from .types import Environment
  
  
  def interpret(source, env=None):
      """
      Interpret a DIY Lang program statement
  
      Accepts a program statement as a string, interprets it, and then
      returns the resulting DIY Lang expression as string.
      """
      if env is None:
          env = Environment()
  
      return unparse(evaluate(parse(source), env))
  
  
  def interpret_file(filename, env=None):
      """
      Interpret a DIY Lang file
  
      Accepts the name of a DIY Lang file containing a series of statements.
      Returns the value of the last expression of the file.
      """
      if env is None:
          env = Environment()
  
      with open(filename, 'r') as sourcefile:
          source = "".join(sourcefile.readlines())
  
      asts = parse_multiple(source)
      results = [evaluate(ast, env) for ast in asts]
      return unparse(results[-1])
  
subject: Remove unused imports in interpeter.