Testing of existence of a repeated field in a protobuff message

Question

I have a google protobuf message:

message Foo {
  required int bar = 1;
}

I know that in order to test the fields of message, we can use:

foo.bar = 1
assert foo.HasField("bar")

However "HasField" doesn't work for repeated field types. How to test for existence of field for "repeated type" of fields?

message Foo {
  repeated int bar = 1;
}

Answer 1

You could try to test the lenght of the repeated field:

assert len(foo.bar) == 0