Support the callable() function

src/runtime/builtin_modules/builtins.cpp

@@ -673,6 +673,12 @@ Box* eval(Box* code) {
     return runEval(static_cast<BoxedString*>(code)->s.c_str(), locals, module);
 }
 
+static Box* callable(Box* obj) {
+    Box* r = PyBool_FromLong((long)PyCallable_Check(obj));
+    checkAndThrowCAPIException();
+    return r;
+}
+
 BoxedClass* notimplemented_cls;
 BoxedModule* builtins_module;
 
@@ -1146,6 +1152,8 @@ void setupBuiltins() {
 
     builtins_module->giveAttr(
         "eval", new BoxedBuiltinFunctionOrMethod(boxRTFunction((void*)eval, UNKNOWN, 1, 0, false, false), "eval"));
+    builtins_module->giveAttr("callable",
+                              new BoxedBuiltinFunctionOrMethod(boxRTFunction((void*)callable, UNKNOWN, 1), "callable"));
 
     BoxedClass* buffer_cls = BoxedHeapClass::create(type_cls, object_cls, NULL, 0, 0, sizeof(Box), false, "buffer");
     builtins_module->giveAttr("buffer", buffer_cls);

test/tests/builtins.py

@@ -92,3 +92,7 @@ print l
 print bytes
 print bytes is str
 print repr(b'1234')
+
+print callable(1)
+print callable(int)
+print callable(lambda: 1)