docs: def rand_str(min_char=MIN_CHR, max_char=MAX_CHR, min_len=MIN_STRLEN, 
               max_len=MAX_STRLEN, func=chr, **kwargs):
      '''For values in the (extended) ASCII range, regardless of Python version.
      '''
      l = randint(min_len, max_len)
  
      ret = ''
      for k in xrange(l):
          ret += func(randint(min_char, max_char))
      return ret