Prompt Foundry is a comprehensive tool for prompt engineering, management, and evaluation. It is designed to simplify the development and integration process for developers working on Python AI applications utilizing large language models (LLMs).
The Prompt Foundry Python library provides convenient access to the Prompt Foundry REST API from any Python 3.7+ application. The library includes type definitions for all request params and response fields, and offers both synchronous and asynchronous clients powered by httpx.
To use this SDK, you need a Prompt Foundry account. Sign up at promptfoundry.ai. Follow the getting started guide in our documentation to get set up.
# install from PyPI
pip install --pre prompt_foundry_python_sdkThe full Prompt Foundry documentation can be found at docs.promptfoundry.ai.
Initiates a completion request to the configured LLM provider using specified parameters and provided variables. This endpoint abstracts the integration with different model providers, enabling seamless switching between models while maintaining a consistent data model for your application.
import os
from prompt_foundry_python_sdk import PromptFoundry
client = PromptFoundry(
# This is the default and can be omitted
api_key=os.environ.get("PROMPT_FOUNDRY_API_KEY"),
)
completion_create_response = client.completion.create(
id="1212121",
append_messages=[{
"role": "user",
"content": [{
"type": "TEXT",
"text": "What is the weather in Seattle, WA?",
}],
}],
)
print(completion_create_response.message)Fetches the configured model parameters and messages rendered with the provided variables mapped to the set LLM provider. This endpoint abstracts the need to handle mapping between different providers, while still allowing direct calls to the providers.
Install the OpenAI SDK
pip install openaiImport the OpenAI and Prompt Foundry SDKs
import os
from prompt_foundry_python_sdk import PromptFoundry
from openai import OpenAI
# Initialize Prompt Foundry SDK with your API key
pf = PromptFoundry(
api_key=os.environ.get("PROMPT_FOUNDRY_API_KEY"),
)
# Initialize OpenAI SDK with your API key
openai = OpenAI(
api_key=os.environ.get("OPENAI_API_KEY"),
)
def main():
try:
# Retrieve model parameters for the prompt
model_parameters = pf.prompts.get_parameters(
"1212121",
variables={"hello": "world"},
append_messages=[{
"role": "user",
"content": [{
"type": "TEXT",
"text": "What is the weather in Seattle, WA?",
}],
}],
)
# Check if provider is OpenAI
if model_parameters.provider == "openai":
# Use the retrieved parameters to create a chat completion request
model_response = openai.chat.completions.create(
**model_parameters.parameters
)
# Print the response from OpenAI
print(model_response.data)
except Exception as e:
print(f"Error: {e}")
if __name__ == "__main__":
main()Install the Anthropic SDK
pip install anthropicImport the Anthropic and Prompt Foundry SDKs
import os
from prompt_foundry_python_sdk import PromptFoundry
from anthropic import Anthropic
# Initialize Prompt Foundry SDK with your API key
pf = PromptFoundry(
api_key=os.environ.get("PROMPT_FOUNDRY_API_KEY"),
)
# Initialize Anthropic SDK with your API key
anthropic = client = Anthropic(
api_key=os.environ.get("ANTHROPIC_API_KEY"),
)
def main():
try:
# Retrieve model parameters for the prompt
model_parameters = pf.prompts.get_parameters(
"1212121",
variables={"hello": "world"},
append_messages=[{
"role": "user",
"content": [{
"type": "TEXT",
"text": "What is the weather in Seattle, WA?",
}],
}],
)
# Check if provider is Anthropic
if model_parameters.provider == "anthropic":
# Use the retrieved parameters to create a chat request
message = client.messages.create(
**model_parameters.parameters
)
print(message.content)
except Exception as e:
print(f"Error: {e}")
if __name__ == "__main__":
main()While you can provide a api_key keyword argument,
we recommend using python-dotenv
to add PROMPT_FOUNDRY_API_KEY="My API Key" to your .env file
so that your API Key is not stored in source control.
Simply import AsyncPromptFoundry instead of PromptFoundry and use await with each API call:
import os
import asyncio
from prompt_foundry_python_sdk import AsyncPromptFoundry
client = AsyncPromptFoundry(
# This is the default and can be omitted
api_key=os.environ.get("PROMPT_FOUNDRY_API_KEY"),
)
async def main() -> None:
completion_create_response = await client.completion.create(
id="1212121",
append_messages=[
{
"role": "user",
"content": [
{
"type": "TEXT",
"text": "What is the weather in Seattle, WA?",
}
],
}
],
)
print(completion_create_response.message)
asyncio.run(main())Functionality between the synchronous and asynchronous clients is otherwise identical.
Nested request parameters are TypedDicts. Responses are Pydantic models which also provide helper methods for things like:
- Serializing back into JSON,
model.to_json() - Converting to a dictionary,
model.to_dict()
Typed requests and responses provide autocomplete and documentation within your editor. If you would like to see type errors in VS Code to help catch bugs earlier, set python.analysis.typeCheckingMode to basic.
When the library is unable to connect to the API (for example, due to network connection problems or a timeout), a subclass of prompt_foundry_python_sdk.APIConnectionError is raised.
When the API returns a non-success status code (that is, 4xx or 5xx
response), a subclass of prompt_foundry_python_sdk.APIStatusError is raised, containing status_code and response properties.
All errors inherit from prompt_foundry_python_sdk.APIError.
import prompt_foundry_python_sdk
from prompt_foundry_python_sdk import PromptFoundry
client = PromptFoundry()
try:
client.completion.create(
id="1212121",
)
except prompt_foundry_python_sdk.APIConnectionError as e:
print("The server could not be reached")
print(e.__cause__) # an underlying Exception, likely raised within httpx.
except prompt_foundry_python_sdk.RateLimitError as e:
print("A 429 status code was received; we should back off a bit.")
except prompt_foundry_python_sdk.APIStatusError as e:
print("Another non-200-range status code was received")
print(e.status_code)
print(e.response)Error codes are as followed:
| Status Code | Error Type |
|---|---|
| 400 | BadRequestError |
| 401 | AuthenticationError |
| 403 | PermissionDeniedError |
| 404 | NotFoundError |
| 422 | UnprocessableEntityError |
| 429 | RateLimitError |
| >=500 | InternalServerError |
| N/A | APIConnectionError |
Certain errors are automatically retried 2 times by default, with a short exponential backoff. Connection errors (for example, due to a network connectivity problem), 408 Request Timeout, 409 Conflict, 429 Rate Limit, and >=500 Internal errors are all retried by default.
You can use the max_retries option to configure or disable retry settings:
from prompt_foundry_python_sdk import PromptFoundry
# Configure the default for all requests:
client = PromptFoundry(
# default is 2
max_retries=0,
)
# Or, configure per-request:
client.with_options(max_retries=5).completion.create(
id="1212121",
)By default requests time out after 1 minute. You can configure this with a timeout option,
which accepts a float or an httpx.Timeout object:
from prompt_foundry_python_sdk import PromptFoundry
# Configure the default for all requests:
client = PromptFoundry(
# 20 seconds (default is 1 minute)
timeout=20.0,
)
# More granular control:
client = PromptFoundry(
timeout=httpx.Timeout(60.0, read=5.0, write=10.0, connect=2.0),
)
# Override per-request:
client.with_options(timeout=5.0).completion.create(
id="1212121",
)On timeout, an APITimeoutError is thrown.
Note that requests that time out are retried twice by default.
We use the standard library logging module.
You can enable logging by setting the environment variable PROMPT_FOUNDRY_LOG to debug.
export PROMPT_FOUNDRY_LOG=debugIn an API response, a field may be explicitly null, or missing entirely; in either case, its value is None in this library. You can differentiate the two cases with .model_fields_set:
if response.my_field is None:
if 'my_field' not in response.model_fields_set:
print('Got json like {}, without a "my_field" key present at all.')
else:
print('Got json like {"my_field": null}.')The "raw" Response object can be accessed by prefixing .with_raw_response. to any HTTP method call, e.g.,
from prompt_foundry_python_sdk import PromptFoundry
client = PromptFoundry()
response = client.completion.with_raw_response.create(
id="1212121",
)
print(response.headers.get('X-My-Header'))
completion = response.parse() # get the object that `completion.create()` would have returned
print(completion.provider)These methods return an APIResponse object.
The async client returns an AsyncAPIResponse with the same structure, the only difference being awaitable methods for reading the response content.
The above interface eagerly reads the full response body when you make the request, which may not always be what you want.
To stream the response body, use .with_streaming_response instead, which requires a context manager and only reads the response body once you call .read(), .text(), .json(), .iter_bytes(), .iter_text(), .iter_lines() or .parse(). In the async client, these are async methods.
with client.completion.with_streaming_response.create(
id="1212121",
) as response:
print(response.headers.get("X-My-Header"))
for line in response.iter_lines():
print(line)The context manager is required so that the response will reliably be closed.
This library is typed for convenient access to the documented API.
If you need to access undocumented endpoints, params, or response properties, the library can still be used.
To make requests to undocumented endpoints, you can make requests using client.get, client.post, and other
http verbs. Options on the client will be respected (such as retries) will be respected when making this
request.
import httpx
response = client.post(
"/foo",
cast_to=httpx.Response,
body={"my_param": True},
)
print(response.headers.get("x-foo"))If you want to explicitly send an extra param, you can do so with the extra_query, extra_body, and extra_headers request
options.
To access undocumented response properties, you can access the extra fields like response.unknown_prop. You
can also get all the extra fields on the Pydantic model as a dict with
response.model_extra.
You can directly override the httpx client to customize it for your use case, including:
- Support for proxies
- Custom transports
- Additional advanced functionality
from prompt_foundry_python_sdk import PromptFoundry, DefaultHttpxClient
client = PromptFoundry(
# Or use the `PROMPT_FOUNDRY_BASE_URL` env var
base_url="http://my.test.server.example.com:8083",
http_client=DefaultHttpxClient(
proxies="http://my.test.proxy.example.com",
transport=httpx.HTTPTransport(local_address="0.0.0.0"),
),
)You can also customize the client on a per-request basis by using with_options():
client.with_options(http_client=DefaultHttpxClient(...))By default the library closes underlying HTTP connections whenever the client is garbage collected. You can manually close the client using the .close() method if desired, or with a context manager that closes when exiting.
This package generally follows SemVer conventions, though certain backwards-incompatible changes may be released as minor versions:
- Changes that only affect static types, without breaking runtime behavior.
- Changes to library internals which are technically public but not intended or documented for external use. (Please open a GitHub issue to let us know if you are relying on such internals).
- Changes that we do not expect to impact the vast majority of users in practice.
We take backwards-compatibility seriously and work hard to ensure you can rely on a smooth upgrade experience.
We are keen for your feedback; please open an issue with questions, bugs, or suggestions.
Python 3.7 or higher.
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