> Reverse Contact API documentation. This is the Markdown copy of https://docs.reversecontact.com/sdk/python/filter-constants
> Every page is listed at https://docs.reversecontact.com/llms.txt, every endpoint with its credit cost and status at https://docs.reversecontact.com/catalog.json

# Filter values as constants

> Use Python string enums for industries, countries, job functions and other fixed search filters, while still accepting new API values as strings.

- Last verified: 2026-11-04

From version 0.1.6, you can use string enums for values from fixed lists: `Industry`, `CountryCode`, `JobFunction`, `JobSubFunction`, `Seniority`, `ContractType`, `Area` and `EmailType`. Each member equals its string value: `Industry.SOFTWARE_DEVELOPMENT == "Software Development"`.

Member names use the value in capitals, with `_` for spaces and punctuation and `AND` for `&`. Examples include `Seniority.OWNER_FOUNDER`, `Area.MC_DACH` and `ContractType.FULL_TIME`.

**Filter with constants**

```python [Python SDK]
import os

from reversecontact import Area, Industry, ReverseContact, Seniority

with ReverseContact(api_key=os.environ["RC_API_KEY"]) as client:
    count = client.search.count_people(
        current_company_industry=Industry.SOFTWARE_DEVELOPMENT,
        current_seniority=[Seniority.CXO, Seniority.OWNER_FOUNDER],
        location={"area": Area.MC_DACH},
    )
    print("Matches:", count.data.count if count.data else None)
```

Filters also accept plain strings. You can use a value added to a list after your SDK version without updating the package. A value the API does not know returns HTTP `422` and costs 0 credits.

## Read available values

Call `people_fields()` or `organizations_fields()` on [client.search](https://docs.reversecontact.com/sdk/python/search) to read the API's available search fields and allowed values. Both calls are free.

The package also exports `EmailVerificationStatus` for [Verify Email](https://docs.reversecontact.com/sdk/python/contact#verify_email) verdicts. This enum describes results rather than search filters. For an example of searching with filters, see [Search within a budget](https://docs.reversecontact.com/sdk/python/search-budget).

Return to the [Python SDK overview](https://docs.reversecontact.com/sdk/python).

## FAQ

### Which filter enums does the Python SDK export?

The SDK exports `Industry`, `CountryCode`, `JobFunction`, `JobSubFunction`, `Seniority`, `ContractType`, `Area` and `EmailType` as string enums.

### Can I pass a string instead of a Python SDK enum?

Filters accept plain strings, so newly supported API values work without upgrading the SDK. An unknown API value returns HTTP 422 and costs no credits.

### How do I list allowed search values in Python?

Call `client.search.people_fields()` or `client.search.organizations_fields()` to read the API's available fields and allowed values at no credit cost.