Issue #16443: Add docstrings to regular expression match objects.

Patch by Anton Kasyanov.

Misc/ACKS

@@ -499,6 +499,7 @@ Tamito Kajiyama
 Peter van Kampen
 Jacob Kaplan-Moss
 Piotr Kasprzyk
+Anton Kasyanov
 Lou Kates
 Hiroaki Kawai
 Sebastien Keim

Misc/NEWS

@@ -160,6 +160,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #16443: Add docstrings to regular expression match objects.
+  Patch by Anton Kasyanov.
+
 - Issue #8853: Allow port to be of type long for socket.getaddrinfo().
 
 - Issue #16597: In buffered and text IO, call close() on the underlying stream

Modules/_sre.c

@@ -3545,14 +3545,54 @@ match_deepcopy(MatchObject* self, PyObject* memo)
 #endif
 }
 
-static struct PyMethodDef match_methods[] = {
-    {"group", (PyCFunction) match_group, METH_VARARGS},
-    {"start", (PyCFunction) match_start, METH_VARARGS},
-    {"end", (PyCFunction) match_end, METH_VARARGS},
-    {"span", (PyCFunction) match_span, METH_VARARGS},
-    {"groups", (PyCFunction) match_groups, METH_VARARGS|METH_KEYWORDS},
-    {"groupdict", (PyCFunction) match_groupdict, METH_VARARGS|METH_KEYWORDS},
-    {"expand", (PyCFunction) match_expand, METH_O},
+PyDoc_STRVAR(match_doc,
+"The result of re.match() and re.search().\n\
+Match objects always have a boolean value of True.");
+
+PyDoc_STRVAR(match_group_doc,
+"group([group1, ...]) -> str or tuple.\n\
+    Return subgroup(s) of the match by indices or names.\n\
+    For 0 returns the entire match.");
+
+PyDoc_STRVAR(match_start_doc,
+"start([group=0]) -> int.\n\
+    Return index of the start of the substring matched by group.");
+
+PyDoc_STRVAR(match_end_doc,
+"end([group=0]) -> int.\n\
+    Return index of the end of the substring matched by group.");
+
+PyDoc_STRVAR(match_span_doc,
+"span([group]) -> tuple.\n\
+    For MatchObject m, return the 2-tuple (m.start(group), m.end(group)).");
+
+PyDoc_STRVAR(match_groups_doc,
+"groups([default=None]) -> tuple.\n\
+    Return a tuple containing all the subgroups of the match, from 1.\n\
+    The default argument is used for groups\n\
+    that did not participate in the match");
+
+PyDoc_STRVAR(match_groupdict_doc,
+"groupdict([default=None]) -> dict.\n\
+    Return a dictionary containing all the named subgroups of the match,\n\
+    keyed by the subgroup name. The default argument is used for groups\n\
+    that did not participate in the match");
+
+PyDoc_STRVAR(match_expand_doc,
+"expand(template) -> str.\n\
+    Return the string obtained by doing backslash substitution\n\
+    on the string template, as done by the sub() method.");
+
+static PyMethodDef match_methods[] = {
+    {"group", (PyCFunction) match_group, METH_VARARGS, match_group_doc},
+    {"start", (PyCFunction) match_start, METH_VARARGS, match_start_doc},
+    {"end", (PyCFunction) match_end, METH_VARARGS, match_end_doc},
+    {"span", (PyCFunction) match_span, METH_VARARGS, match_span_doc},
+    {"groups", (PyCFunction) match_groups, METH_VARARGS|METH_KEYWORDS,
+        match_groups_doc},
+    {"groupdict", (PyCFunction) match_groupdict, METH_VARARGS|METH_KEYWORDS,
+        match_groupdict_doc},
+    {"expand", (PyCFunction) match_expand, METH_O, match_expand_doc},
     {"__copy__", (PyCFunction) match_copy, METH_NOARGS},
     {"__deepcopy__", (PyCFunction) match_deepcopy, METH_O},
     {NULL, NULL}
@@ -3632,7 +3672,7 @@ static PyTypeObject Match_Type = {
     0,                          /* tp_setattro */
     0,                          /* tp_as_buffer */
     Py_TPFLAGS_DEFAULT,
-    0,                          /* tp_doc */
+    match_doc,                  /* tp_doc */
     0,                          /* tp_traverse */
     0,                          /* tp_clear */
     0,                          /* tp_richcompare */