gaston 0.4.0

Python client for the Gaston API (transcription, translation and sentence search).

Gaston API Client

A small, typed Python client for the Gaston API: transcription, translation and full-text search of sentences within transcribed recordings.

Requires a Gaston account and an API token (see Configuration).

Installation

pip install gaston

Requires Python 3.10+.

For local development from a checkout instead:

pip install -e .

Quick start

from gaston import GastonClient

client = GastonClient(token="gapi-...")

# Who am I + remaining quota
me = client.me()
print(me.email, "files left:", me.usage.files_left)

# Transcribe a local file
result = client.transcribe("interview.mp4", lang="en", title="My interview")
print(result.id, result.state)

# Transcribe from a URL (YouTube or web)
client.transcribe_url("https://youtu.be/dQw4w9WgXcQ", lang="en")

# Translate an existing transcription
client.translate(result.id, target_lang="de")

# Speaker diarization (requires a completed translation in that language)
client.diarize(result.id, lang="de", speakers=2)

# List your media (paginated). Items are Media objects.
page = client.list_media(page=1)
print("total:", page.total, "pages:", page.pages)
for item in page:
    print(item.id, item.title, item.state, item.available_languages)

# Fetch a single media item with its sentences
media = client.get_media(result.id, lang="en")
for sentence in media.sentences:
    print(sentence.id, sentence.text, sentence.speaker)

# Full text search across the whole library
results = client.search("climate change", max_=20)
print("total matches:", results.total)
for hit in results:
    print(hit["_sentence"]["body"], "->", hit["_highlight"]["body"])

See Search for query syntax and filtering options.

Configuration

Generate an API token in the Gaston app under Settings -> API. Full endpoint documentation is available at https://www.gaston.live/en/api.

The token can be supplied directly or via an environment variable:

Argument	Environment variable	Default
token	GASTON_API_TOKEN	(required)

# Uses GASTON_API_TOKEN from the environment
with GastonClient() as client:
    ...

Timeouts

Ordinary requests use a 30s timeout. The file upload in transcribe can take minutes for large files, so it uses a separate, more generous upload_timeout (default (10s connect, 600s read)).

A timeout may be a single float, a (connect, read) tuple, or None to wait indefinitely.

# Customise the defaults for all calls
client = GastonClient(
    token="gapi-...",
    timeout=30,
    upload_timeout=(10, 1800),   # allow up to 30 min to upload large files
)

# Or override per call (e.g. no read timeout for a very large file)
client.transcribe("huge-recording.mp4", timeout=(10, None))

Directories

folder = client.create_directory("Podcasts")
client.update_directory(folder.id, title="Podcast archive")
client.move_media(media_id="me...", dir_id=folder.id)
tree = client.directory_tree()
client.delete_directory(folder.id)

Search

client.search(query, from_=0, max_=50, dir_ids=None, lang=None) runs a full-text search over every sentence in your transcribed media.

Query syntax

The query supports a subset of the Lucene query_string syntax:

Feature	Example	Notes
Boolean AND	cats AND dogs	both terms must appear
Boolean OR	cats OR dogs	either term
Boolean NOT	cats NOT dogs	exclude a term
Grouping	(cats OR dogs) AND vet	combine operators with parentheses
Exact phrase	"climate change"	quoted terms match as a phrase
Trailing wildcard	transcri*	matches transcribe, transcription...

Leading wildcards (*tion), field selectors, fuzzy (~), boosts (^) and ranges are not supported and are stripped server-side. Queries must be at least 3 characters.

results = client.search('(invoice OR receipt) AND "due date" NOT draft')

Filtering and pagination

# Search within a single directory
client.search("budget", dir_ids=[42])

# Search across several directories
client.search("budget", dir_ids=[42, 43, 7])

# Restrict to one language, and page through results
page2 = client.search("budget", from_=50, max_=50, lang="en")

Reading results

search() returns a SearchResults object. Iterate it for hits, or read .total for the overall match count. Each hit is a dict with:

• _sentence - the matched sentence plus its media metadata (id, title, duration, directory, thumbnail, file, originUrl).
• _highlight - matched fragments with the hit terms wrapped in <hlt>...</hlt> tags.

results = client.search("climate change", max_=20)
print("total matches:", results.total)
for hit in results:
    sentence = hit["_sentence"]
    print(sentence["media"]["title"], "|", hit["_highlight"]["body"])

Error handling

All failures raise a subclass of GastonError:

from gaston import GastonClient, AuthenticationError, RateLimitError, NotFoundError

try:
    client.transcribe("clip.mp4")
except RateLimitError:
    print("File limit reached")
except AuthenticationError:
    print("Bad token / disabled account")
except NotFoundError as e:
    print("Not found:", e.message)

Exception	Trigger
AuthenticationError	HTTP 403, invalid token / disabled user
BadRequestError	HTTP 400, invalid parameters
NotFoundError	HTTP 404, resource not found
RateLimitError	HTTP 429, usage limit exceeded
GastonAPIError	any other API error

Every exception carries .status_code, .message, .details and the raw .payload.

Supported languages

from gaston import SUPPORTED_LANGUAGES, TRANSLATION_LANGUAGES

SUPPORTED_LANGUAGES lists transcription source languages; TRANSLATION_LANGUAGES lists the available translation targets.