The py5 library is different from the typical Python library in that the code itself is the output of the meta-programming project py5generator. This approach is necessary because of the size, depth, and complexity of Processing.
You will need to download and install
Anaconda. You’ll also
need build tools such as
ant, as well as the source control
Clone Source Repository from GitHub#
You will need to clone the py5generator repo from GitHub. If you don’t already have the Processing 4 application on your computer, you’ll need to download that too.
On my computer I keep all of the py5 repos together in one directory.
$ mkdir pythonprocessing $ cd pythonprocessing $ git clone https://github.com/py5coding/py5generator
Install Java 17#
You will need to have Java 17 installed on your computer and available on your path. Relevant information about how to install the correct version is available on the py5 install page.
Create Anaconda Environment#
Next you will need to create the Anaconda environment. This will install Python packages that go beyond what is necessary for regular py5 use.
$ cd py5generator $ conda env create -f environment.yml $ conda activate py5 (py5) $ cd ..
Locate Processing Application#
When the build process runs, the code will search for and copy
jars from the Processing PDE application directory into a specific location in
the destination directory. It is important to download the correct (latest)
version of the Processing application. On my machine, I keep the Processing PDE
The Java classes need to be compiled with debug information because
the meta-programming code parses the output of
javap to inspect the
Processing jars and gather information about the relevant public fields and
methods. Currently Processing jars are compiled with debug information enabled.
If this were to ever change, the build process would need to change to adapt.
Run the py5 Makefile#
Finally, run the Makefile. The
processing_dir parameter needs to point
to the location of the Processing application. The
py5_build_dir parameter is
where the generated code will go.
(py5) $ cd py5generator (py5) $ make processing_dir=~/INSTALL/processing-4 py5_build_dir=../py5code skip_autopep8=true
The Makefile uses
realpath. You may need to install the “coreutils” package if
you don’t have it on your machine already.
skip_autopep8 argument will skip autopep8 formatting of
the output code, accelerating the build process. Use this during
A full build takes under a minute to complete. When this runs you’ll see a lot of logging information appear on the screen. There will be a few warnings about skipping typehints for some Matrix functions, but everything else will be info messages. You should familiarize yourself with the logs so you can spot changes and identify when something goes wrong.
The final Makefile step installs the generated code into the active Anaconda environment. At this point the new code will be available for you to use.
When the build process detects changes to Processing’s methods and fields, a
message will appear in the logs. This process is designed to adapt as the
Processing library evolves. Be aware that signature changes to known methods
will result in automatic updates to documentation files in the
There is an additional
make command for generating reference documentation for
(py5) $ make generate_py5_docs py5_website_dir=../py5book py5_api_lang=api_en