I'm trying to embed a Python 3 interpreter in an Objective C Cocoa app on a Mac, following instructions in this answer (which extends this article) and building Python and PyObjC by hand.
I'd like to be able to run Python code as plugins. I specifically don't want to rely on the stock Apple Python (v2.7). I have most of it working but can't seem to reliably load the plugin scripts. It looks like the embedded Python interpreter is unable to create the __pycache__/*.pyc files. This may be a symptom, or a cause. If I import the plugin file manually from the Python3 REPL (via import or the imp or importlib modules) the .pyc is generated and the plugin then loads correctly. If I don't do this manually the .pyc is not created and I receive a ValueError "Unmarshallable object".
I've tried loosening permissions on the script directory to no avail. The cache_tag looks OK, both from the REPL and from within the bouncer script:
>>> sys.implementation.cache_tag
'cpython-35'
py_compile raises a Cocoa exception if I try and compile the plugin file manually (I'm still digging into that).
I'm using the following:
- OS X 10.11.5 (El Capitan)
- XCode 7.2.1
- Python v3.5.2
- PyObjC v3.11
I had to make a couple of necessary tweaks to the process outlined in the linked SO answer:
Compiling Python 3 required Homebrew versions of OpenSSL and zlib, and appropriate LDFLAGS and CPPFLAGS:
export CPPFLAGS="-I$(brew --prefix openssl)/include -I$(brew --prefix zlib)/include"
export LDFLAGS="-L$(brew --prefix openssl)/lib -L$(brew --prefix zlib)/lib"
I also ensure pip is installed OK when configuring Python to build:
./configure --prefix="/path/to/python/devbuild/python3.5.2" --with-ensurepip=install
There is a fork of the original article source (which uses the stock Python2) that works fine here, so I suspect I'm not too far off the mark. Any idea what I've missed? Do I need to sign, or otherwise give permission to, the embedded Python? Are there complilation/configuration options I've neglected to set?
TIA
