py: Add .real and .imag attributes to complex numbers.

py/objcomplex.c

@@ -132,6 +132,15 @@ STATIC mp_obj_t complex_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
     return mp_obj_complex_binary_op(op, lhs->real, lhs->imag, rhs_in);
 }
 
+STATIC void complex_load_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
+    mp_obj_complex_t *self = self_in;
+    if (attr == MP_QSTR_real) {
+        dest[0] = mp_obj_new_float(self->real);
+    } else if (attr == MP_QSTR_imag) {
+        dest[0] = mp_obj_new_float(self->imag);
+    }
+}
+
 const mp_obj_type_t mp_type_complex = {
     { &mp_type_type },
     .name = MP_QSTR_complex,
@@ -139,6 +148,7 @@ const mp_obj_type_t mp_type_complex = {
     .make_new = complex_make_new,
     .unary_op = complex_unary_op,
     .binary_op = complex_binary_op,
+    .load_attr = complex_load_attr,
 };
 
 mp_obj_t mp_obj_new_complex(mp_float_t real, mp_float_t imag) {

py/qstrdefs.h

@@ -136,7 +136,11 @@ Q(calcsize)
 Q(chr)
 Q(classmethod)
 Q(_collections)
+#if MICROPY_PY_BUILTINS_COMPLEX
 Q(complex)
+Q(real)
+Q(imag)
+#endif
 Q(dict)
 Q(dir)
 Q(divmod)