PY-18595 Use annotation from type comment for the first parameter of static methods

python/src/com/jetbrains/python/codeInsight/PyTypingTypeProvider.java

@@ -97,7 +97,7 @@ public class PyTypingTypeProvider extends PyTypeProviderBase {
         final List<PyCallableParameter> paramTypes = functionType.getParameters(context);
         assert paramTypes != null;
         final PyParameter[] funcParams = func.getParameterList().getParameters();
-        final int startOffset = func.getContainingClass() != null ? 1 : 0;
+        final int startOffset = omitFirstParamInTypeComment(func) ? 1 : 0;
         for (int paramIndex = 0; paramIndex < funcParams.length; paramIndex++) {
           if (funcParams[paramIndex] == param) {
             final int typeIndex = paramIndex - startOffset;
@@ -112,6 +112,10 @@ public class PyTypingTypeProvider extends PyTypeProviderBase {
     return null;
   }
 
+  private static boolean omitFirstParamInTypeComment(@NotNull PyFunction func) {
+    return func.getContainingClass() != null && func.getModifier() != PyFunction.Modifier.STATICMETHOD;
+  }
+
   @Nullable
   @Override
   public Ref<PyType> getReturnType(@NotNull PyCallable callable, @NotNull TypeEvalContext context) {

python/testSrc/com/jetbrains/python/PyTypingTest.java

@@ -461,6 +461,17 @@ public class PyTypingTest extends PyTestCase {
            "expr = f");
   }
 
+  // PY-18595
+  public void testFunctionTypeCommentForStaticMethod() {
+    doTest("int",
+           "class C:\n" +
+           "    @staticmethod\n" +
+           "    def m(some_int, some_bool, some_str):\n" +
+           "        # type: (int, bool, str) -> bool\n" +
+           "        expr = some_int");
+
+  }
+
   private void doTestNoInjectedText(@NotNull String text) {
     myFixture.configureByText(PythonFileType.INSTANCE, text);
     final InjectedLanguageManager languageManager = InjectedLanguageManager.getInstance(myFixture.getProject());