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pypyr

task-runner for automation pipelines defined in yaml·pypyr.io

pypyr is a free, open-source task-runner CLI and Python API for defining and running automation pipelines in yaml. It lets users sequence steps, conditionally execute or loop tasks, handle errors and retries, and combine shell commands, scripts, and Python code into a single repeatable pipeline. It is commonly used for devops, CI/CD orchestration, and configuration file management.

What it's for

Automating CI/CD and devops task sequencesCombining commands, scripts and applications into one pipelineRunning the same CI/CD process locally as on a cloud providerConditional execution, branching and looping over custom codeParallel/concurrent execution of subprocesses and shell commandsAutomatic retries and error handling for failing commands or scriptsVariable interpolation and substitution across strings and data structuresLoading, merging, and writing configuration files (json, toml, yaml)Bootstrapping configuration for systems like Terraform, Cloudformation and HeatBuilding custom CLI applications using pypyr as a framework

Features 17

Agentless execution model
Automatic retries on failure
Conditional execution of steps
Configuration file tokenization for json, toml and yaml
Custom CLI argument parsing via context parsers
Custom error handling and failure handlers
Docker container available for running pypyr
Foreach and while loops
Over 30 built-in ready-made steps
Parallel/concurrent subprocess execution
Pipelines can call other pipelines (modular step sequences/step groups)
Python API for programmatic pipeline invocation
Runs shell, cmd, external executables, scripts, and inline Python code
Sequential task workflow execution
Support for custom user-defined steps
Variable interpolation and substitution with {token} placeholders
YAML-defined pipeline steps

At a glance

free tieropen sourceAPI

TypeCLI tool

DeploymentInstalled (local)

PlatformsWindows, macOS, Linux

LanguagesEN

Fordevelopers, devops engineers

Companypypyr

Integrations

AWSDockerSlackCloudformationHeatTerraform

Resources

Docs

Pricing

pypyr is entirely free and open-source; no paid plans are offered.

FreeFree

pypyr is free and open-source software; no paid tiers are offered.