docs: def md5(string, n=32, encoding="utf-8", skip_encode=False):
      """str(obj) -> md5_string
  
      :param string: string to operate.
      :param n: md5_str length.
  
      >>> from torequests.utils import md5
      >>> md5(1, 10)
      '923820dcc5'
      >>> md5('test')
      '098f6bcd4621d373cade4e832627b4f6'
      """
      todo = string if skip_encode else unicode(string).encode(encoding)
      if n == 32:
          return hashlib.md5(todo).hexdigest()
      elif isinstance(n, (int, float)):
          return hashlib.md5(todo).hexdigest()[(32 - n) // 2 : (n - 32) // 2]
      elif isinstance(n, (tuple, list)):
          return hashlib.md5(todo).hexdigest()[n[0] : n[1]]