code: def nla_get_u64(nla):
      
      tmp = c_uint64(0)
      if nla and nla_len(nla) >= sizeof(tmp):
          tmp = c_uint64.from_buffer(nla_data(nla)[:SIZEOF_U64])
      return int(tmp.value)
docs: Return value of 64 bit integer attribute as an int().
  
      https://github.com/thom311/libnl/blob/libnl3_2_25/lib/attr.c#L649
  
      Positional arguments:
      nla -- 64 bit integer attribute (nlattr class instance).
  
      Returns:
      Payload as an int().