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import: Implement "from pkg.mod import sym" syntax properly.

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http://docs.python.org/3.3/library/functions.html#__import__ :
"When the name variable is of the form package.module, normally, the
top-level package (the name up till the first dot) is returned, not
the module named by name. However, when a non-empty fromlist argument
is given, the module named by name is returned."
This commit is contained in:
Paul Sokolovsky 2014-02-20 00:29:54 +02:00
parent 46239413d0
commit fb7f94392d
2 changed files with 34 additions and 3 deletions
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19
py/builtinimport.c
View File

@ -132,13 +132,18 @@ void do_load(mp_obj_t module_obj, vstr_t *file) {
mp_obj_t mp_builtin___import__(int n_args, mp_obj_t *args) {
/*
printf("import:\n");
for (int i = 0; i < n; i++) {
for (int i = 0; i < n_args; i++) {
printf(" ");
mp_obj_print(args[i]);
mp_obj_print(args[i], PRINT_REPR);
printf("\n");
}
*/
mp_obj_t fromtuple = mp_const_none;
if (n_args >= 4) {
fromtuple = args[3];
}
uint mod_len;
const char *mod_str = (const char*)mp_obj_str_get_data(args[0], &mod_len);
@ -150,8 +155,11 @@ mp_obj_t mp_builtin___import__(int n_args, mp_obj_t *args) {
if (p == NULL) {
return module_obj;
}
// If fromlist is not empty, return leaf module
if (fromtuple != mp_const_none) {
return module_obj;
}
// Otherwise, we need to return top-level package
// TODO: subject to fromlist arg
qstr pkg_name = qstr_from_strn(mod_str, p - mod_str);
return mp_obj_module_get(pkg_name);
}
@ -227,6 +235,11 @@ mp_obj_t mp_builtin___import__(int n_args, mp_obj_t *args) {
assert(0);
}
// If fromlist is not empty, return leaf module
if (fromtuple != mp_const_none) {
return module_obj;
}
// Otherwise, we need to return top-level package
return top_module_obj;
}

18
tests/basics/import-pkg2.py Normal file
View File

@ -0,0 +1,18 @@
from pkg.mod import foo
try:
pkg
except NameError:
print("NameError")
try:
pkg.mod
except NameError:
print("NameError")
print(foo())
# Import few times, must be same module objects
mod_1 = __import__("pkg.mod", None, None, ("foo",))
mod_2 = __import__("pkg.mod", None, None, ("foo",))
print(mod_1 is mod_2)
print(mod_1.foo is mod_2.foo)
print(foo is mod_1.foo)