Implement C API function PySequence_GetSlice.

Author: fangerer

graalpython/com.oracle.graal.python.cext/src/abstract.c

@@ -311,6 +311,11 @@ int PySequence_SetItem(PyObject *s, Py_ssize_t i, PyObject *o) {
     return UPCALL_CEXT_I(_jls_PySequence_SetItem, native_to_java(s), i, native_to_java(o));
 }
 
+UPCALL_ID(PySequence_GetSlice);
+PyObject* PySequence_GetSlice(PyObject *s, Py_ssize_t i1, Py_ssize_t i2) {
+	return UPCALL_CEXT_O(_jls_PySequence_GetSlice, native_to_java(s), i1, i2);
+}
+
 UPCALL_ID(PySequence_Tuple);
 PyObject* PySequence_Tuple(PyObject *v) {
     return UPCALL_CEXT_O(_jls_PySequence_Tuple, native_to_java(v));

graalpython/lib-graalpython/python_cext.py

@@ -634,6 +634,11 @@ def PySequence_SetItem(obj, key, value):
     return 0
 
 
+@may_raise
+def PySequence_GetSlice(obj, low, high):
+    return obj[low:high]
+
+
 @may_raise(-1)
 def PySequence_Contains(haystack, needle):
     return needle in haystack