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 | Posted by Brett
in reply to jmh530 |  Permalink Reply |
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Brett 
Posted in reply to jmh530
| On Tuesday, 17 September 2019 at 15:21:37 UTC, jmh530 wrote:
> On Tuesday, 17 September 2019 at 01:54:01 UTC, Brett wrote:
>> How does one get return values?
>>
>> https://matplotlib.org/3.1.0/gallery/statistics/hist.html
>>
>> Shows that python uses return values to set properties of the plot
>>
>> https://github.com/koji-kojiro/matplotlib-d/blob/master/examples/source/app.d
>>
>> Does not give any examples of return values and when trying gives error about void returns.
>
> If I'm reading the following comment [1] correctly, this feature may require changes to matplotlib-d to implement.
>
>
> [1] https://github.com/koji-kojiro/matplotlib-d/issues/7#issuecomment-274001515
That was over 2 years ago, it seems he isn't interested in making it work. In his code he uses pipes...
void call(string py_script) {
import std.process: environment, pipeProcess, wait, Redirect;
auto py_path = environment.get("MATPLOTLIB_D_PYTHON", "python3");
py_path = `python.exe`;
auto pipes = pipeProcess(py_path, Redirect.stdin | Redirect.stderr);
pipes.stdin.writeln(py_script);
pipes.stdin.writeln("exit()");
pipes.stdin.close();
auto result = wait(pipes.pid);
if (result != 0) {
string error;
foreach (line; pipes.stderr.byLine)
error ~= line ~ "\n";
throw new Exception("\n\nERROR occurred in Python:\n" ~ error);
}
}
Not sure if this can be modified to work with returns? I guess they could be exported through json and possible read and used?
I don't see how it could work though since it seems that pointers will be returned. I don't know enough about python to know if some mechanism would work.
Maybe some python code could be created to call D and pass info back and forth or some better interprocess communications can be used?
He's essentially just send commands through text(py_script) that are executed on the python side of things. Nothing ever really takes place in D.
I guess a return type could could done on the python side too but it would require modifying the code and would be overly complex.
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