langflow

library1.10.0pypypiunverified

Langflow is a low-code Python package for building AI agents and RAG applications through a visual flowchart interface. Version 1.9.1 is the latest; the project follows a monthly release cadence. It supports Python >=3.10 and includes a built-in web application for drag-and-drop workflow design.

llm-agents ai-ml workflow web-framework http-networking

pip install langflow

github ↗package ↗homepage ↗docs ↗

INSTALL

IMPORT

SIG · LANGFLOW

langflow

llm-agentspythonv1.10.0

Install

—

Import

—

Disk

—

Pass rate

0/ 10

Env Coverage0 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v? · pip install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.910 runs

build_error

glibc

py 3.10–3.910 runs

timeout

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

Langflow

✓ from langflow import Langflow

✗ import langflow

Direct import of module does not expose the main class; use from langflow import Langflow

start

✓ from langflow import start

✗ from langflow.server import start

The start function moved in v1.0+ to the top-level package

Start the Langflow web application programmatically. The server will be accessible at http://127.0.0.1:7860.

from langflow import start # Start Langflow server on default port 7860 start( host="127.0.0.1", port=7860, open_browser=False, components_path="./components", log_level="INFO" )

langflow --version

Debug

Known issues

breakingIn v1.0, the import path for the main entry point changed from `langflow.server` to `langflow`. Old code `from langflow.server import app` will fail.

fix

Use `from langflow import start` or `from langflow import Langflow`.

affects: v1.0+

deprecatedThe `langflow run` CLI command is deprecated in favor of `langflow serve` or the Python API.

fix

Use `langflow serve` or call `start()` from Python.

affects: >=1.5.0

gotchaLangflow stores flow data in a SQLite database by default; it is not thread-safe for multiple processes. Running multiple workers may cause database corruption.

fix

Set the `LANGFLOW_DATABASE_URL` environment variable to a PostgreSQL database for production.

affects: all

gotchaWhen using Playwright for headless browser automation, ensure the Playwright browsers are installed (e.g., `playwright install chromium`). Missing browsers cause `RuntimeError: Could not find browser revision`.

fix

Run `playwright install chromium` after installing Langflow.

affects: >=1.8.0

Upgrade

Version history

1.10.0latest on PyPI · released Jun 9, 2026

Audit

Dependencies

uvicornrequiredRequired to run the FastAPI-based web server

fastapirequiredCore web framework for the API

sqlmodelrequiredORM for database operations

Agent activity

37 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/langflow-ai/langflow ↗

packagehttps://pypi.org/project/langflow/ ↗

homepagehttps://www.langflow.org ↗

docshttps://docs.langflow.org ↗