The pip installation will using the binary versions of the package (if possible). These contain a bundled version of capnproto (on Linux compiled with manylinux). Starting from v1.0.0b1 binary releases are available for Windows, macOS and Linux from pypi:
[sudo] pip install pycapnp
To force rebuilding the pip package from source (you'll need requirments.txt or pipenv):
pip install --no-binary :all: pycapnp
To force bundling libcapnp (or force system libcapnp), just in case setup.py isn't doing the right thing:
pip install --no-binary :all: -C force-bundled-libcapnp=True
pip install --no-binary :all: -C force-system-libcapnp=True
If you're using an older Linux distro (e.g. CentOS 6) you many need to set `LDFLAGS="-Wl,--no-as-needed -lrt"`:
LDFLAGS="-Wl,--no-as-needed -lrt" pip install --no-binary :all: pycapnp
It's also possible to specify the libcapnp url when bundling (this may not work, there be dragons):
pip install --no-binary :all: -C force-bundled-libcapnp=True -C libcapnp-url="https://github.com/capnproto/capnproto/archive/master.tar.gz"
Source installation is generally not needed unless you're looking into an issue with capnproto or pycapnp itself.
You need to install the C++ Cap'n Proto library first. It requires a C++ compiler with C++14 support, such as GCC 5+ or Clang 5+. Follow installation docs at https://capnproto.org/install.html.
If you want the latest development version, you can clone the github repo:
git clone https://github.com/capnproto/pycapnp.git
For development packages use one of the following to install the python dependencies:
pipenv install
pip install -r requirements.txt
And install pycapnp with:
cd pycapnp
pip install .
or:
cd pycapnp
python setup.py install
Clone the repo from https://github.com/capnproto/pycapnp.git:
git clone https://github.com/capnproto/pycapnp.git
For development packages use one of the following to install the python dependencies:
pipenv install
pip install -r requirements.txt
Building:
cd pycapnp
pip install .
or:
cd pycapnp
python setup.py install
Useful targets for setup.py:
python setup.py build
python setup.py clean
Useful command-line arguments are available for setup.py:
--force-bundled-libcapnp
--force-system-libcapnp
--libcapnp-url
Testing is done through pytest:
cd pycapnp
pytest
pytest test/test_rpc_calculator.py
Once you're done installing, take a look at the quickstart