votes up 4

Field number 0 is illegal.

Exception Class:

Raise code

          self._unknown_field_set = containers.UnknownFieldSet()
          # pylint: disable=protected-access
          unknown_field_set = self._unknown_field_set
        # pylint: disable=protected-access
        (tag, _) = decoder._DecodeVarint(tag_bytes, 0)
        field_number, wire_type = wire_format.UnpackTag(tag)
        if field_number == 0:
          raise message_mod.DecodeError('Field number 0 is illegal.')
        # TODO(jieluo): remove old_pos.
        old_pos = new_pos
        (data, new_pos) = decoder._DecodeUnknownField(
            buffer, new_pos, wire_type)  # pylint: disable=protected-access
        if new_pos == -1:
          return pos
        # pylint: disable=protected-access
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Ways to fix

votes up 2 votes down

Protocol buffers are a language-neutral, platform-neutral extensible mechanism for serializing structured data. Protocol buffers are Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data – think XML, but smaller, faster, and simpler. Here is the official website.

To download Protocol buffers for python, check here

When a message is encoded, the keys and values are concatenated into a byte stream. The "key" for each pair in a wire-format message is actually two values – the field number from your .proto file, plus a wire type that provides just enough information to find the length of the following value. In most language implementations this key is referred to as a tag. ...

Here is an example of message protocol.

syntax = "proto2";

package tutorial;

message Person {
  optional string name = 1;
  optional int32 id = 2;
  optional string email = 3;

  enum PhoneType {
    MOBILE = 0;
    HOME = 1;
    WORK = 2;

  message PhoneNumber {
    optional string number = 1;
    optional PhoneType type = 2 [default = HOME];

  repeated PhoneNumber phones = 4;

message AddressBook {
  repeated Person people = 1;

Examples are taken here. To create your address book application, you'll need to start with a .proto file. The definitions in a .proto file is simple: you add a message for each data structure you want to serialize, then specify a name and a type for each field in the message. Here is the .proto file that defines your messages, addressbook.proto.

To compile protocol

protoc -I=$SRC_DIR --python_out=$DST_DIR $SRC_DIR/addressbook.proto

This generates in your specified destination directory.

So, an error raises when we define our message protocol. Need to more precise about field numbers. Each field numbers need to be a unique and positive integer between 1-15.

Jul 03, 2021 anonim answer
anonim 13.0k

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