add a scope class to manage the context of interaction with Python an…

…d simplify the variable exchanging
pythonnet · den-run-ai · Jun 9, 2017 · Mar 3, 2017 · Feb 15, 2017 · Feb 23, 2017
commit 72003aa45b3378e57b18a15b78f016641bdbee44
diff --git a/src/embed_tests/Python.EmbeddingTest.csproj b/src/embed_tests/Python.EmbeddingTest.csproj
@@ -98,6 +98,7 @@
     <Compile Include="TestPythonEngineProperties.cs" />
     <Compile Include="TestPyTuple.cs" />
     <Compile Include="TestRuntime.cs" />
+    <Compile Include="pyscope.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\runtime\Python.Runtime.csproj">

diff --git a/src/embed_tests/pyscope.cs b/src/embed_tests/pyscope.cs
@@ -0,0 +1,113 @@
+using NUnit.Framework;
+using Python.Runtime;
+
+namespace Python.EmbeddingTest
+{
+    [TestFixture]
+    public class PyScopeTest
+    {
+        PyScope ps;
+
+        [SetUp]
+        public void SetUp()
+        {
+            ps = Py.Session("test");
+        }
+
+        [TearDown]
+        public void TearDown()
+        {
+            ps.Dispose();
+        }
+
+        /// <summary>
+        /// Eval a Python expression and obtain its return value.
+        /// </summary>
+        [Test]
+        public void TestEval()
+        {
+            ps.SetLocal("a", 1);
+            int result = ps.Eval<int>("a+2");
+            Assert.AreEqual(result, 3);
+        }
+
+        /// <summary>
+        /// Exec Python statements and obtain the local variables created.
+        /// </summary>
+        [Test]
+        public void TestExec()
+        {
+            ps.SetGlobal("bb", 100); //declare a global variable
+            ps.SetLocal("cc", 10); //declare a local variable
+            ps.Exec("aa=bb+cc+3");
+            int result = ps.Get<System.Int32>("aa");
+            Assert.AreEqual(result, 113);
+        }
+
+        /// <summary>
+        /// Exec Python statements in a subscope of the session then discard it.
+        /// </summary>
+        [Test]
+        public void TestSubScope()
+        {
+            ps.SetGlobal("bb", 100); //declare a global variable
+            ps.SetLocal("cc", 10); //declare a local variable
+
+            PyScope scope = ps.SubScope();
+            scope.Exec("aa=bb+cc+3");
+            int result = scope.Get<System.Int32>("aa");
+            Assert.AreEqual(result, 113); //
+            scope.Dispose();
+
+            Assert.IsFalse(ps.Exists("aa"));
+        }
+
+        /// <summary>
+        /// Import a python module into the session.
+        /// Equivalent to the Python "import" statement.
+        /// </summary>
+        [Test]
+        public void TestImport()
+        {
+            dynamic sys = ps.Import("sys");
+            Assert.IsTrue(ps.Exists("sys"));
+
+            ps.Exec("sys.attr1 = 2");
+            int value1 = ps.Eval<int>("sys.attr1");
+            int value2 = (int)sys.attr1.AsManagedObject(typeof(int));
+            Assert.AreEqual(value1, 2);
+            Assert.AreEqual(value2, 2);
+        }
+
+        /// <summary>
+        /// Import a python module into the session with a new name.
+        /// Equivalent to the Python "import .. as .." statement.
+        /// </summary>
+        [Test]
+        public void TestImportAs()
+        {
+            ps.ImportAs("sys", "sys1");
+            Assert.IsTrue(ps.Exists("sys1"));
+        }
+
+        /// <summary>
+        /// Suspend the Session, and reuse it later.
+        /// </summary>
+        [Test]
+        public void TestSuspend()
+        {
+            ps.SetGlobal("bb", 100);
+            ps.SetLocal("cc", 10);
+            ps.Suspend();
+
+            using (Py.GIL())
+            {
+                PythonEngine.RunSimpleString("import sys;");
+            }
+
+            ps.Exec("aa=bb+cc+3");
+            int result = ps.Get<System.Int32>("aa");
+            Assert.AreEqual(result, 113);
+        }
+    }
+}