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py/modsys: Allow sys.path to be assigned to.

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Previously sys.path could be modified by append/pop or slice assignment.

This allows `sys.path = [...]`, which can be simpler in many cases, but
also improves CPython compatibility.

It also allows sys.path to be set to a tuple which means that you can
clear sys.path (e.g. temporarily) with no allocations.

This also makes sys.path (and sys.argv for consistency) able to be disabled
via mpconfig. The unix port (and upytesthelper) require them, so they
explicitly verify that they're enabled.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
This commit is contained in:
Jim Mussared
2023-06-05 16:52:29 +10:00
parent 7d2ee8aed0
commit 5e50975a6d
9 changed files with 93 additions and 42 deletions
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py/builtinimport.c
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@@ -118,7 +118,7 @@ STATIC mp_import_stat_t stat_top_level(qstr mod_name, vstr_t *dest) {
#if MICROPY_PY_SYS
size_t path_num;
mp_obj_t *path_items;
mp_obj_list_get(mp_sys_path, &path_num, &path_items);
mp_obj_get_array(mp_sys_path, &path_num, &path_items);
// go through each sys.path entry, trying to import "<entry>/<mod_name>".
for (size_t i = 0; i < path_num; i++) {
@@ -365,7 +365,7 @@ STATIC mp_obj_t process_import_at_level(qstr full_mod_name, qstr level_mod_name,
// which may have come from the filesystem.
size_t path_num;
mp_obj_t *path_items;
mp_obj_list_get(mp_sys_path, &path_num, &path_items);
mp_obj_get_array(mp_sys_path, &path_num, &path_items);
if (path_num)
#endif
{