docs: def execfile(fname, _globals, _locals):
      """
      Usage: execfile('path/to/file.py', globals(), locals())
      """
      if os.path.exists(fname):
          with open(fname) as f:
              code = compile(f.read(), os.path.basename(fname), 'exec')
              exec(code, _globals, _locals)
              return True
      else:
          return False