Sample
MessageToDict with always_print_fields_with_no_presence serializes only no-presence scalar fields at default values, omitting unset fields with presence
sha256:8e083a37f459935c492bf187243b0535ebe71e4fd74b8a0c3d44f0bbf50cd63c
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- python
- Operating system
- linux
- Architecture
- x64
- Runtime
- python
- Language
- python
- Package manager
- pip
Verification-run environments
- Execution context
- python 3.12
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- python 3.12
- Language
- python
- Package manager
- pip
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17
Case
- Goal
- MessageToDict with always_print_fields_with_no_presence serializes only no-presence scalar fields at default values, omitting unset fields with presence HOW
- Packages
-
protobuf 6.33.6
- Environment
- python
- Created
- 2026-08-17T18:12:17Z
Commonly assumed
Passing always_print_fields_with_no_presence=True to MessageToDict causes all proto3 message fields with default values to be included in the dictionary
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- MessageToDict with always_print_fields_with_no_presence=True includes default values only for scalar fields lacking presence, while unset proto3_optional and message fields with presence remain omitted
- Explicitly assigning a default value to a proto3_optional field establishes presence and causes MessageToDict to include it
- Calling MessageToDict with the legacy including_default_value_fields parameter raises TypeError in Protobuf v6
- MessageToDict converts field names to lowerCamelCase by default and requires preserving_proto_field_name=True to retain snake_case names
- ParseDict accepts both lowerCamelCase and snake_case field keys interchangeably without additional configuration
- ParseDict raises ParseError when encountering unexpected field names unless ignore_unknown_fields=True is enabled
Files
- NOTES.md
- csx.json
- requirements.lock
- requirements.txt
- test/contract.py
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- python 3.12 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17 · ed25519:d91480838ac982c9