appmap 2.1.2

Create AppMap files by recording a Python application.

• About
• Usage
• Development
  • Getting the code
  • Python version support
  • Dependency management
    • wrapt
  • Linting
  • Testing
    • pytest
    • tox
  • Code Coverage

About

appmap-python is a Python package for recording AppMaps of your code. "AppMap" is a data format which records code structure (modules, classes, and methods), code execution events (function calls and returns), and code metadata (repo name, repo URL, commit SHA, labels, etc). It's more granular than a performance profile, but it's less granular than a full debug trace. It's designed to be optimal for understanding the design intent and structure of code and key data flows.

Usage

Visit the AppMap for Python reference page on AppLand.com for a complete reference guide.

Development

Getting the code

Clone the repo to begin development.

% git clone https://github.com/applandinc/appmap-python.git
Cloning into 'appmap-python'...
remote: Enumerating objects: 167, done.
remote: Counting objects: 100% (167/167), done.
remote: Compressing objects: 100% (100/100), done.
remote: Total 962 (delta 95), reused 116 (delta 61), pack-reused 795
Receiving objects: 100% (962/962), 217.31 KiB | 4.62 MiB/s, done.
Resolving deltas: 100% (653/653), done.

Python version support

As a package intended to be installed in as many environments as possible, appmap-python needs to avoid using features of Python or the standard library that were added after the oldest version currently supported (see the supported versions).

Dependency management

poetry for dependency management:

% brew install poetry
% cd appmap-python
% poetry install

wrapt

The one dependency that is not managed using poetry is wrapt. Because it's possible that projects that use appmap may also need an unmodified version of wrapt (e.g. pylint depends on astroid, which in turn depends on wrapt), we use vendoring to vendor wrapt.

To update wrapt, use tox (described below) to run the vendoring environment.

Linting

pylint for linting:

% cd appmap-python
% poetry run pylint appmap

--------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)

[Note that the current configuration has a threshold set which must be met for the Travis build to pass. To make this easier to achieve, a number of checks have both been disabled. They should be reenabled as soon as possible.]

Testing

pytest

Note that you must install the dependencies contained in requirements-dev.txt before running tests. See the explanation in pyproject.toml for details.

Additionally, the tests currently require that you set APPMAP=true. You can either run pytest with appmap-python (see tox.ini), or you can explicitly set the environment variable.

pytest for testing:

% cd appmap-python
% pip install -r requirements-test.txt
% poetry run pytest

tox

Additionally, the tox configuration provides the ability to run the tests for all supported versions of Python and Django.

tox requires that all the correct versions of Python to be available to create the test environments. pyenv is an easy way to manage multiple versions of Python, and the xxenv-latest plugin can help get all the latest versions.

% brew install pyenv
% git clone https://github.com/momo-lab/xxenv-latest.git "$(pyenv root)"/plugins/xxenv-latest
% cd appmap-python
% pyenv latest local 3.{9,6,7,8}
% for v in 3.{9,6,7,8}; do pyenv latest install $v; done
% poetry run tox

Code Coverage

coverage for coverage:

% cd appmap-python
% poetry run coverage run -m pytest
% poetry run coverage html
% open htmlcov/index.html