pythonnet/src/embed_tests/TestPyScope.cs at master · MITEM/pythonnet · GitHub

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using System;

using NUnit.Framework;

using Python.Runtime;

namespace Python.EmbeddingTest

{

public class PyScopeTest

{

private PyScope ps;

[SetUp]

public void SetUp()

{

using (Py.GIL())

{

ps = Py.CreateScope("test");

}

[TearDown]

public void Dispose()

{

using (Py.GIL())

{

ps.Dispose();

ps = null;

}

/// <summary>

/// Eval a Python expression and obtain its return value.

/// </summary>

[Test]

public void TestEval()

{

using (Py.GIL())

{

ps.Set("a", 1);

var result = ps.Eval<int>("a + 2");

Assert.AreEqual(3, result);

}

/// <summary>

/// Exec Python statements and obtain the variables created.

/// </summary>

[Test]

public void TestExec()

{

using (Py.GIL())

{

ps.Set("bb", 100); //declare a global variable

ps.Set("cc", 10); //declare a local variable

ps.Exec("aa = bb + cc + 3");

var result = ps.Get<int>("aa");

Assert.AreEqual(113, result);

}

/// <summary>

/// Compile an expression into an ast object;

/// Execute the ast and obtain its return value.

/// </summary>

[Test]

public void TestCompileExpression()

{

using (Py.GIL())

{

ps.Set("bb", 100); //declare a global variable

ps.Set("cc", 10); //declare a local variable

PyObject script = PythonEngine.Compile("bb + cc + 3", "", RunFlagType.Eval);

var result = ps.Execute<int>(script);

Assert.AreEqual(113, result);

}

/// <summary>

/// Compile Python statements into an ast object;

/// Execute the ast;

/// Obtain the local variables created.

/// </summary>

[Test]

public void TestCompileStatements()

{

using (Py.GIL())

{

ps.Set("bb", 100); //declare a global variable

ps.Set("cc", 10); //declare a local variable

PyObject script = PythonEngine.Compile("aa = bb + cc + 3", "", RunFlagType.File);

ps.Execute(script);

var result = ps.Get<int>("aa");

Assert.AreEqual(113, result);

}

/// <summary>

/// Create a function in the scope, then the function can read variables in the scope.

/// It cannot write the variables unless it uses the 'global' keyword.

/// </summary>

[Test]

public void TestScopeFunction()

{

using (Py.GIL())

{

ps.Set("bb", 100);

ps.Set("cc", 10);

ps.Exec(

"def func1():\n" +

" bb = cc + 10\n");

dynamic func1 = ps.Get("func1");

func1(); //call the function, it can be called any times

var result = ps.Get<int>("bb");

Assert.AreEqual(100, result);

ps.Set("bb", 100);

ps.Set("cc", 10);

ps.Exec(

"def func2():\n" +

" global bb\n" +

" bb = cc + 10\n");

dynamic func2 = ps.Get("func2");

func2();

result = ps.Get<int>("bb");

Assert.AreEqual(20, result);

}

/// <summary>

/// Create a class in the scope, the class can read variables in the scope.

/// Its methods can write the variables with the help of 'global' keyword.

/// </summary>

[Test]

public void TestScopeClass()

{

using (Py.GIL())

{

dynamic _ps = ps;

_ps.bb = 100;

ps.Exec(

"class Class1():\n" +

" def __init__(self, value):\n" +

" self.value = value\n" +

" def call(self, arg):\n" +

" return self.value + bb + arg\n" + //use scope variables

" def update(self, arg):\n" +

" global bb\n" +

" bb = self.value + arg\n" //update scope variable

);

dynamic obj1 = _ps.Class1(20);

var result = obj1.call(10).As<int>();

Assert.AreEqual(130, result);

obj1.update(10);

result = ps.Get<int>("bb");

Assert.AreEqual(30, result);

}

/// <summary>

/// Import a python module into the session.

/// Equivalent to the Python "import" statement.

/// </summary>

[Test]

public void TestImportModule()

{

using (Py.GIL())

{

dynamic sys = ps.Import("sys");

Assert.IsTrue(ps.Contains("sys"));

ps.Exec("sys.attr1 = 2");

var value1 = ps.Eval<int>("sys.attr1");

var value2 = sys.attr1.As<int>();

Assert.AreEqual(2, value1);

Assert.AreEqual(2, value2);

//import as

ps.Import("sys", "sys1");

Assert.IsTrue(ps.Contains("sys1"));

}

/// <summary>

/// Create a scope and import variables from a scope,

/// exec Python statements in the scope then discard it.

/// </summary>

[Test]

public void TestImportScope()

{

using (Py.GIL())

{

ps.Set("bb", 100);

ps.Set("cc", 10);

using (var scope = Py.CreateScope())

{

scope.Import(ps, "ps");

scope.Exec("aa = ps.bb + ps.cc + 3");

var result = scope.Get<int>("aa");

Assert.AreEqual(113, result);

}

Assert.IsFalse(ps.Contains("aa"));

}

/// <summary>

/// Create a scope and import variables from a scope,

/// exec Python statements in the scope then discard it.

/// </summary>

[Test]

public void TestImportAllFromScope()

{

using (Py.GIL())

{

ps.Set("bb", 100);

ps.Set("cc", 10);

using (var scope = ps.NewScope())

{

scope.Exec("aa = bb + cc + 3");

var result = scope.Get<int>("aa");

Assert.AreEqual(113, result);

}

Assert.IsFalse(ps.Contains("aa"));

}

/// <summary>

/// Create a scope and import variables from a scope,

/// call the function imported.

/// </summary>

[Test]

public void TestImportScopeFunction()

{

using (Py.GIL())

{

ps.Set("bb", 100);

ps.Set("cc", 10);

ps.Exec(

"def func1():\n" +

" return cc + bb\n");

using (PyScope scope = ps.NewScope())

{

//'func1' is imported from the origion scope

scope.Exec(

"def func2():\n" +

" return func1() - cc - bb\n");

dynamic func2 = scope.Get("func2");

var result1 = func2().As<int>();

Assert.AreEqual(0, result1);

scope.Set("cc", 20);//it has no effect on the globals of 'func1'

var result2 = func2().As<int>();

Assert.AreEqual(-10, result2);

scope.Set("cc", 10); //rollback

ps.Set("cc", 20);

var result3 = func2().As<int>();

Assert.AreEqual(10, result3);

ps.Set("cc", 10); //rollback

}

/// <summary>

/// Import a python module into the session with a new name.

/// Equivalent to the Python "import .. as .." statement.

/// </summary>

[Test]

public void TestImportScopeByName()

{

using (Py.GIL())

{

ps.Set("bb", 100);

using (var scope = Py.CreateScope())

{

scope.ImportAll("test");

//scope.ImportModule("test");

Assert.IsTrue(scope.Contains("bb"));

}

/// <summary>

/// Use the locals() and globals() method just like in python module

/// </summary>

[Test]

public void TestVariables()

{

(ps.Variables() as dynamic)["ee"] = new PyInt(200);

var a0 = ps.Get<int>("ee");

Assert.AreEqual(200, a0);

ps.Exec("locals()['ee'] = 210");

var a1 = ps.Get<int>("ee");

Assert.AreEqual(210, a1);

ps.Exec("globals()['ee'] = 220");

var a2 = ps.Get<int>("ee");

Assert.AreEqual(220, a2);

using (var item = ps.Variables())

{

item["ee"] = new PyInt(230);

}

var a3 = ps.Get<int>("ee");

Assert.AreEqual(230, a3);

}

/// <summary>

/// Share a pyscope by multiple threads.

/// </summary>

[Test]

public void TestThread()

{

//After the proposal here https://github.com/pythonnet/pythonnet/pull/419 complished,

//the BeginAllowThreads statement blow and the last EndAllowThreads statement

//should be removed.

dynamic _ps = ps;

var ts = PythonEngine.BeginAllowThreads();

using (Py.GIL())

{

_ps.res = 0;

_ps.bb = 100;

_ps.th_cnt = 0;

//add function to the scope

//can be call many times, more efficient than ast

ps.Exec(

"def update():\n" +

" global res, th_cnt\n" +

" res += bb + 1\n" +

" th_cnt += 1\n"

);

}

int th_cnt = 3;

for (int i =0; i< th_cnt; i++)

{

System.Threading.Thread th = new System.Threading.Thread(()=>

{

using (Py.GIL())

{

//ps.GetVariable<dynamic>("update")(); //call the scope function dynamicly

_ps.update();

}

});

th.Start();

}

//equivalent to Thread.Join, make the main thread join the GIL competition

int cnt = 0;

while(cnt != th_cnt)

{

using (Py.GIL())

{

cnt = ps.Get<int>("th_cnt");

}

System.Threading.Thread.Sleep(10);

}

using (Py.GIL())

{

var result = ps.Get<int>("res");

Assert.AreEqual(101* th_cnt, result);

}

PythonEngine.EndAllowThreads(ts);

}

pythonnet/src/embed_tests/TestPyScope.cs at master · MITEM/pythonnet · GitHub

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