Skip to main content
This is a pre-production deployment of Warehouse. Changes made here affect the production instance of PyPI (
Help us improve Python packaging - Donate today!

ASCII-ART Data Analysis Pipeline Manager

Project Description

pyleaf is the Python implementation of the Leaf system. The Leaf system is a pipeline (AKA data flow or data analysis protocol) management system that allows to design the pipeline as an ASCII-art diagram through a language called LGL (Leaf Graph Language, see

Main Leaf features include:

  • Thin, lightweight, code-independent Abstraction Layer.
  • Data flow graph embedded directly into Python source code.
  • Automatic creation and management of variables associated with node outputs.
  • Automatic persistent storage and retrieval of node outputs.
  • Session persistence (i.e. run half project, reboot machine, automatically start again from the last processed node).
  • Lazy builds (avoid running nodes that are not necessary for the build of a requested resource).
  • Multiprocessing (independent nodes run in parallel).
  • Enforcement of code version consistency between nodes (i.e. automatically reprocess all nodes deriving from node A if node A is found to be changed).
  • Automatic time and space requirements statistics.
  • Automatic publishing (producing hypertext with visual representation of the protocol, processing statistics, link to node outputs, node documentation and source code).
Release History

Release History

This version
History Node

History Node


History Node


History Node


Download Files

Download Files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
pyleaf- (756.7 kB) Copy SHA256 Checksum SHA256 Source Dec 28, 2013

Supported By

WebFaction WebFaction Technical Writing Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Rackspace Rackspace Cloud Servers DreamHost DreamHost Log Hosting