Add empty "micropython" module to allow more seamless CPython portability.

Implicit "micropython" module contains (at least) codegeneration decorators.
Make it explicit, so an app could have "import micropython". On MicroPython,
that will be no-op. On CPython, that will give a chance to have a module
with placeholder decorators.

1 files changed, 7 insertions, 0 deletions

diff --git a/py/runtime.c b/py/runtime.c
index e1e9e31cc..0da3ced05 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -143,6 +143,13 @@ void rt_init(void) {
     mp_map_add_qstr(&map_builtins, MP_QSTR_sum, (mp_obj_t)&mp_builtin_sum_obj);
     mp_map_add_qstr(&map_builtins, MP_QSTR_str, (mp_obj_t)&mp_builtin_str_obj);
 
+#if MICROPY_CPYTHON_COMPAT
+    // Add (empty) micropython module, so it was possible to "import micropython",
+    // which can be a placeholder module on CPython.
+    mp_obj_t m = mp_obj_new_module(qstr_from_str_static("micropython"));
+    rt_store_name(qstr_from_str_static("micropython"), m);
+#endif
+
     next_unique_code_id = 1; // 0 indicates "no code"
     unique_codes_alloc = 0;
     unique_codes = NULL;