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Add __lazy_import__, check sys.modules before import

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Dino Viehland 2025-09-18 14:30:29 -07:00
parent 1c691ea756
commit 3b0d745e73
18 changed files with 272 additions and 40 deletions
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43
Python/bltinmodule.c
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@ -8,6 +8,7 @@
#include "pycore_fileutils.h" // _PyFile_Flush
#include "pycore_floatobject.h" // _PyFloat_ExactDealloc()
#include "pycore_interp.h" // _PyInterpreterState_GetConfig()
#include "pycore_import.h" // _PyImport_LazyImportModuleLevelObject ()
#include "pycore_long.h" // _PyLong_CompactValue
#include "pycore_modsupport.h" // _PyArg_NoKwnames()
#include "pycore_object.h" // _Py_AddToAllObjects()
@ -287,6 +288,47 @@ builtin___import___impl(PyObject *module, PyObject *name, PyObject *globals,
}
/*[clinic input]
__lazy_import__ as builtin___lazy_import__
name: object
globals: object(c_default="NULL") = None
locals: object(c_default="NULL") = None
fromlist: object(c_default="NULL") = ()
level: int = 0
Lazily imports a module.
Returns either the module to be imported or a imp.lazy_module object which
indicates the module to be lazily imported.
[clinic start generated code]*/
static PyObject *
builtin___lazy_import___impl(PyObject *module, PyObject *name,
PyObject *globals, PyObject *locals,
PyObject *fromlist, int level)
/*[clinic end generated code: output=300f1771094b9e8c input=57123e246d6c36ee]*/
{
PyObject *builtins;
PyThreadState *tstate = PyThreadState_GET();
if (globals == NULL) {
globals = PyEval_GetGlobals();
}
if (locals == NULL) {
locals = globals;
}
if (PyMapping_GetOptionalItem(globals, &_Py_ID(__builtins__), &builtins) < 0) {
PyErr_SetString(PyExc_ValueError, "unable to get builtins for lazy import");
return NULL;
}
PyObject *res = _PyImport_LazyImportModuleLevelObject(tstate, name, builtins,
globals, locals, fromlist, level);
Py_DECREF(builtins);
return res;
}
/*[clinic input]
abs as builtin_abs
@ -3344,6 +3386,7 @@ static PyMethodDef builtin_methods[] = {
{"__build_class__", _PyCFunction_CAST(builtin___build_class__),
METH_FASTCALL | METH_KEYWORDS, build_class_doc},
BUILTIN___IMPORT___METHODDEF
BUILTIN___LAZY_IMPORT___METHODDEF
BUILTIN_ABS_METHODDEF
BUILTIN_ALL_METHODDEF
BUILTIN_ANY_METHODDEF