Issue #19288: Fixed the "in" operator of dbm.gnu databases for string

argument.  Original patch by Arfrever Frehtes Taifersar Arahesis.

1 files changed, 13 insertions, 4 deletions

diff --git a/Modules/_gdbmmodule.c b/Modules/_gdbmmodule.c
index 1db021aaa1f..36c06d13b79 100644
--- a/Modules/_gdbmmodule.c
+++ b/Modules/_gdbmmodule.c
@@ -290,20 +290,29 @@ dbm_contains(PyObject *self, PyObject *arg)
 {
     dbmobject *dp = (dbmobject *)self;
     datum key;
+    Py_ssize_t size;
 
     if ((dp)->di_dbm == NULL) {
         PyErr_SetString(DbmError,
                         "GDBM object has already been closed");
         return -1;
     }
-    if (!PyBytes_Check(arg)) {
+    if (PyUnicode_Check(arg)) {
+        key.dptr = PyUnicode_AsUTF8AndSize(arg, &size);
+        key.dsize = size;
+        if (key.dptr == NULL)
+            return -1;
+    }
+    else if (!PyBytes_Check(arg)) {
         PyErr_Format(PyExc_TypeError,
-                     "gdbm key must be bytes, not %.100s",
+                     "gdbm key must be bytes or string, not %.100s",
                      arg->ob_type->tp_name);
         return -1;
     }
-    key.dptr = PyBytes_AS_STRING(arg);
-    key.dsize = PyBytes_GET_SIZE(arg);
+    else {
+        key.dptr = PyBytes_AS_STRING(arg);
+        key.dsize = PyBytes_GET_SIZE(arg);
+    }
     return gdbm_exists(dp->di_dbm, key);
 }