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TestPythonEngineProperties.SetPythonPath avoids corrupting the module search path for later tests #1336

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Merged
lostmsu merged 3 commits into from
Dec 22, 2020
Merged

TestPythonEngineProperties.SetPythonPath avoids corrupting the module search path for later tests #1336

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TestPythonEngineProperties.SetPythonPath avoids corrupting the module…
tminka Dec 21, 2020
5a81268
SetPythonPath uses System.IO.Path.PathSeparator and imports a module …
tminka Dec 21, 2020
33e5042
SetPythonPath computes the path string in a simpler way
tminka Dec 22, 2020
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26 changes: 25 additions & 1 deletion src/embed_tests/TestPythonEngineProperties.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -181,13 +181,37 @@ public void SetProgramName()
public void SetPythonPath()
{
PythonEngine.Initialize();
string path = PythonEngine.PythonPath;

const string moduleName = "pytest";
bool importShouldSucceed;
try
{
Py.Import(moduleName);
importShouldSucceed = true;
}
catch
{
importShouldSucceed = false;
}

string[] paths = Py.Import("sys").GetAttr("path").As<string[]>();
string path = string.Join(System.IO.Path.PathSeparator.ToString(), paths);

// path should not be set to PythonEngine.PythonPath here.
// PythonEngine.PythonPath gets the default module search path, not the full search path.
// The list sys.path is initialized with this value on interpreter startup;
// it can be (and usually is) modified later to change the search path for loading modules.
// See https://docs.python.org/3/c-api/init.html#c.Py_GetPath
// After PythonPath is set, then PythonEngine.PythonPath will correctly return the full search path.

PythonEngine.Shutdown();

PythonEngine.PythonPath = path;
PythonEngine.Initialize();

Assert.AreEqual(path, PythonEngine.PythonPath);
if (importShouldSucceed) Py.Import(moduleName);

PythonEngine.Shutdown();
}
}
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