inconsistency printing to json from ConsoleSpanExporter

[codeboten]

Running the following code:

from opentelemetry import trace
from opentelemetry.sdk.trace import TracerProvider
from opentelemetry.sdk.trace.export import (
    ConsoleSpanExporter,
    SimpleSpanProcessor,
)

trace.set_tracer_provider(TracerProvider())
trace.get_tracer_provider().add_span_processor(
    SimpleSpanProcessor(ConsoleSpanExporter())
)
tracer = trace.get_tracer(__name__)
with tracer.start_as_current_span("foo"):
    with tracer.start_as_current_span("bar"):
        print("Hello world!")

outputs the following span information, note the parent ID formatting is inconsistent:

Hello world!
{
    "name": "bar",
    "context": {
        "trace_id": "0xaba880c3256d04f47bcdecf9bf3ba84e",
        "span_id": "0x3014b62ab356f774",
        "trace_state": "[]"
    },
    "kind": "SpanKind.INTERNAL",
    "parent_id": "53321c6000aabdfe",
    "start_time": "2021-05-10T15:21:55.215847Z",
    "end_time": "2021-05-10T15:21:55.215898Z",
    "status": {
        "status_code": "UNSET"
    },
    "attributes": {},
    "events": [],
    "links": [],
    "resource": {
        "telemetry.sdk.language": "python",
        "telemetry.sdk.name": "opentelemetry",
        "telemetry.sdk.version": "1.2.0.dev0",
        "service.name": "unknown_service"
    }
}
{
    "name": "foo",
    "context": {
        "trace_id": "0xaba880c3256d04f47bcdecf9bf3ba84e",
        "span_id": "0x53321c6000aabdfe",
        "trace_state": "[]"
    },
    "kind": "SpanKind.INTERNAL",
    "parent_id": null,
    "start_time": "2021-05-10T15:21:55.215765Z",
    "end_time": "2021-05-10T15:21:55.216855Z",
    "status": {
        "status_code": "UNSET"
    },
    "attributes": {},
    "events": [],
    "links": [],
    "resource": {
        "telemetry.sdk.language": "python",
        "telemetry.sdk.name": "opentelemetry",
        "telemetry.sdk.version": "1.2.0.dev0",
        "service.name": "unknown_service"
    }
}