PY-8473 Fixed: Recognize copy() and deepcopy() methods in code insight

Add skeletons for copy.copy and copy.deepcopy

python/helpers/python-skeletons/copy.py

@@ -0,0 +1,19 @@
+"""Skeleton for 'copy' stdlib module."""
+
+
+def copy(x):
+    """Return a shallow copy of x.
+
+    :type x: T
+    :rtype: T
+    """
+    pass
+
+
+def deepcopy(x):
+    """Return a deep copy of x.
+
+    :type x: T
+    :rtype: T
+    """
+    pass

python/testData/types/CopyDotCopy/copy.py

@@ -0,0 +1,2 @@
+def copy(x):
+    pass

python/testData/types/CopyDotDeepCopy/copy.py

@@ -0,0 +1,2 @@
+def deepcopy(x):
+    pass

python/testSrc/com/jetbrains/python/PyTypeTest.java

@@ -1258,6 +1258,24 @@ public class PyTypeTest extends PyTestCase {
            "expr = defaultdict(lambda: [])['x']\n");
   }
 
+  // PY-8473
+  public void testCopyDotCopy() {
+    doMultiFileTest("A",
+                    "import copy\n" +
+                    "class A(object):\n" +
+                    "    pass\n" +
+                    "expr = copy.copy(A())\n");
+  }
+
+  // PY-8473
+  public void testCopyDotDeepCopy() {
+    doMultiFileTest("A",
+                    "import copy\n" +
+                    "class A(object):\n" +
+                    "    pass\n" +
+                    "expr = copy.deepcopy(A())\n");
+  }
+
   private static List<TypeEvalContext> getTypeEvalContexts(@NotNull PyExpression element) {
     return ImmutableList.of(TypeEvalContext.codeAnalysis(element.getProject(), element.getContainingFile()).withTracing(),
                             TypeEvalContext.userInitiated(element.getProject(), element.getContainingFile()).withTracing());