On 07/11/2017 00:58, Chris Angelico wrote:
On Tue, Nov 7, 2017 at 10:43 AM, John Pote <johnp...@jptechnical.co.uk> wrote:
Hi all,
I have successfully used Python to perform unit and integration tests in the
past and I'd like to do the same for some C modules I'm working with at
work. There seem to be a number of ways of doing this but being busy at work
and home I looking for the approach with the least learning curve.
I don't want to add the C modules into the CPython build itself as I've
never done this and at work it's a real pain getting admin rights to do
this, and when you do it lasts just 24 hours. The C modules are likely to
change frequently as bugs are found and features added.
Fortunately, you don't have to modify CPython to do this :)
The other option I'm considering is to use sockets and write a C wrapper
round the C modules I want to test. This has the advantage for me that I
know about sockets from Python & C points of view and I get complete control
of the C compile process. This may be important as the C modules come from
an embedded project and I don't want to change them in any way.
Are there any other approachs to this problem?
I'll be using Python 3.5 (work) and 3.6 (home).
Feedback appriciated.
This. The best way to do this is to create a wrapper... but the best
way to create that wrapper is with Cython. (Not to be confused with
CPython.) Check out http://cython.org/ to see what it takes to carry
information into and out of the C module. You'd compile the Cython
wrapper and then import that from Python directly.
Cython seems very confusing to me.
The simplest way for Python to run C is for Python to just run the
executable created using C. If that is possible.
Otherwise what /I/ would look for is ways to call C functions inside
shared libraries (.dll and .so). That requires that the modules under
test be wrapped as a shared library, which may be extra effort (but it
will still be using C, so with familiar tools and no crossover with
Python at this point).
To call shared library C functions from Python I think involves the
ctypes module (I've never done it). Googling 'ctypes shared library'
gives some promising results.
--
bartc
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