Sample
pydantic-settings 2.15.0: Configure nested environment variable parsing explicitly with pydantic-settings instead of assuming a default '__' delimiter
Verified sample for pypi pydantic-settings 2.15.0: Configure nested environment variable parsing explicitly with pydantic-settings instead of assuming a…
sha256:7f1908439a5f4318c360685d9940e1fc18d9314fe820f62a16166c0baf722a75
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
python 3.12 linux x64 python 3.12 python pip
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| python 3.12 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-17 |
| python 3.12 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-18 |
Case
CONFIG- Goal
- Configure nested environment variable parsing explicitly with pydantic-settings instead of assuming a default '__' delimiter
- Symbols
-
- pydantic_settings.BaseSettings
- pydantic_settings.SettingsConfigDict
- pydantic.BaseModel
- Environment
- python 3.12
- Created
- 2026-08-17T03:19:39Z
Contract
- assert a DATABASE__HOST environment variable is ignored for a nested model when env_nested_delimiter is not configured
- assert SettingsConfigDict(env_nested_delimiter='__') maps DATABASE__HOST into database.host
Files
- csx.json
- requirements.txt
- test/contract.py
Source
{"case":{"believed":"Pydantic BaseSettings reads nested environment variables using '__' as a delimiter by default.","caseId":"case:sha256:904be074826920419d9e3c7d3e90205b1afdd6c5ed8e1ca58e827653ec949fbc","contract":["assert a DATABASE__HOST environment variable is ignored for a nested model when env_nested_delimiter is not configured","assert SettingsConfigDict(env_nested_delimiter='__') maps DATABASE__HOST into database.host"],"goal":"Configure nested environment variable parsing explicitly with pydantic-settings instead of assuming a default '__' delimiter","kind":"CONFIG","packages":["pkg:pypi/pydantic-settings@2.15.0","pkg:pypi/pydantic@2.13.4","pkg:pypi/python-dotenv@1.2.2"],"schemaVersion":1,"symbols":["pydantic_settings.BaseSettings","pydantic_settings.SettingsConfigDict","pydantic.BaseModel"]},"contractCommand":["python","test/contract.py"],"environment":{"arch":"x64","ecosystem":"pypi","executionContext":"python","language":"python","os":"linux","packageManager":"pip","runtime":"python","runtimeVersion":"3.12","schemaVersion":1},"license":"MIT-0","packages":["pkg:pypi/pydantic-settings@2.15.0","pkg:pypi/pydantic@2.13.4","pkg:pypi/python-dotenv@1.2.2"],"schemaVersion":1,"symbols":["pydantic_settings.BaseSettings","pydantic_settings.SettingsConfigDict","pydantic.BaseModel"],"verifierAdapter":"python@1"}
pydantic-settings==2.15.0
pydantic==2.13.4
python-dotenv==1.2.2
pydantic-core==2.46.4
annotated-types==0.8.0
typing-extensions==4.15.0
typing-inspection==0.4.2
import os
from pydantic import BaseModel
from pydantic_settings import BaseSettings, SettingsConfigDict
class Database(BaseModel):
host: str = "localhost"
class WithoutDelimiter(BaseSettings):
database: Database = Database()
class WithDelimiter(BaseSettings):
model_config = SettingsConfigDict(env_nested_delimiter="__")
database: Database = Database()
def main() -> None:
key = "DATABASE__HOST"
previous = os.environ.get(key)
os.environ[key] = "127.0.0.1"
try:
assert WithoutDelimiter().database.host == "localhost"
assert WithDelimiter().database.host == "127.0.0.1"
finally:
if previous is None:
os.environ.pop(key, None)
else:
os.environ[key] = previous
if __name__ == "__main__":
main()