Pycograph

Homepage: https://pycograph.com/
PyPI: https://pypi.org/project/pycograph/
RedisConf 2021 talk

Explore your Python code with graph queries

Pycograph creates a RedisGraph model of your Python code. You can:

• query it with Cypher
• visualize it with RedisInsight

Getting Started

Requirements:

• Python 3.8 or higher
• a Redis instance with the RedisGraph module (local, remote or via Docker)
• not strictly necessary, but recommended: RedisInsight for visualizing the query results

Install Pycograph from PyPI:

pip install pycograph

Start a Redis instance with the RedisGraph module and RedisInsight. E.g. via Docker containers:

docker run -d -p 6379:6379 redislabs/redismod
docker run -d -v redisinsight:/db -p 8001:8001 redislabs/redisinsight:latest

Visit your RedisInstance at http://localhost:8001 in a browser.
Connect to your local Redis database.

Create a RedisGraph model of your project's code with the pycograph load command:

pycograph load --project-dir ~/code/your-project --test-types

By default, if you don't provide the --project-dir option, Pycograph tries to find Python code in the current working directory.

Run a query in RedisInsight. E.g.

GRAPH.QUERY "your-project" "MATCH (n) return n"

To see some more advanced queries, check out the examples at pycograph.com

Options

• --project-dir: The root directory of the Python project you want to analyze. If you omit this option, Pycograph will search for .py files in your current working directory.
• --graph-name: Specifies the name of the generated graph. Default: the name of the project directory.
• --overwrite: If a graph with this name exists overwrite it. If you don't provide this flag, the new nodes and edges will be appended to the graph.
• --test-types: Determine the types of tests based on the subdirectories of the tests directory.
• --redis-host: The host of the Redis instance. Default: localhost
• --redis-port: The port of the Redis instance. Default: 6379
• --version: Print Pycograph version and exit.

Limitations

Pycograph is in beta version.

It creates a basic model with focus on the relationships betweeen the different parts of the code base. Even that model might be incomplete, ignoring some less common syntax. The goal is to provide some useful insight, not to create an exhaustive model.

If Pycograph finds a syntax error, it skips the module containing the syntax error and tries to build a model from the rest of the code base.

Below are some of the limitations. If you bump into other limitations, please open a GitHub issue.

Imports

The following imports will be ignored by Pycograph:

• imported external packages
• import * syntax
• variables
• globals

Calls

• All the limitations of the imports.

Other Known Limitations

• No support for .py files containing Jinja templates (e.g. cookiecutter)
• Inner functions are ignored.

How Does It Work?

Libraries used:

• ast module of the Python standard library for the abstract syntax tree
• Pydantic both for the models of the intermediate objects and for the settings
• redisgraph-py for creating the RedisGraph model
• typer for the command line interface

Contributing

see the Contributing guide