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

Patch by Anton Kasyanov.

Misc/ACKS

@@ -543,6 +543,7 @@ Peter van Kampen
 Rafe Kaplan
 Jacob Kaplan-Moss
 Jan Kaliszewski
+Anton Kasyanov
 Lou Kates
 Hiroaki Kawai
 Sebastien Keim

Misc/NEWS

@@ -179,6 +179,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #16443: Add docstrings to regular expression match objects.
+  Patch by Anton Kasyanov.
+
 - Issue #16646: ftplib.FTP.makeport() might lose socket error details.
   (patch by Serhiy Storchaka)
 

Modules/_sre.c

@@ -2559,35 +2559,35 @@ pattern_deepcopy(PatternObject* self, PyObject* memo)
 }
 
 PyDoc_STRVAR(pattern_match_doc,
-"match(string[, pos[, endpos]]) --> match object or None.\n\
+"match(string[, pos[, endpos]]) -> match object or None.\n\n\
     Matches zero or more characters at the beginning of the string");
 
 PyDoc_STRVAR(pattern_search_doc,
-"search(string[, pos[, endpos]]) --> match object or None.\n\
+"search(string[, pos[, endpos]]) -> match object or None.\n\n\
     Scan through string looking for a match, and return a corresponding\n\
     MatchObject instance. Return None if no position in the string matches.");
 
 PyDoc_STRVAR(pattern_split_doc,
-"split(string[, maxsplit = 0])  --> list.\n\
+"split(string[, maxsplit = 0])  -> list.\n\n\
     Split string by the occurrences of pattern.");
 
 PyDoc_STRVAR(pattern_findall_doc,
-"findall(string[, pos[, endpos]]) --> list.\n\
+"findall(string[, pos[, endpos]]) -> list.\n\n\
    Return a list of all non-overlapping matches of pattern in string.");
 
 PyDoc_STRVAR(pattern_finditer_doc,
-"finditer(string[, pos[, endpos]]) --> iterator.\n\
+"finditer(string[, pos[, endpos]]) -> iterator.\n\n\
     Return an iterator over all non-overlapping matches for the \n\
     RE pattern in string. For each match, the iterator returns a\n\
     match object.");
 
 PyDoc_STRVAR(pattern_sub_doc,
-"sub(repl, string[, count = 0]) --> newstring\n\
+"sub(repl, string[, count = 0]) -> newstring.\n\n\
     Return the string obtained by replacing the leftmost non-overlapping\n\
     occurrences of pattern in string by the replacement repl.");
 
 PyDoc_STRVAR(pattern_subn_doc,
-"subn(repl, string[, count = 0]) --> (newstring, number of subs)\n\
+"subn(repl, string[, count = 0]) -> (newstring, number of subs)\n\n\
     Return the tuple (new_string, number_of_subs_made) found by replacing\n\
     the leftmost non-overlapping occurrences of pattern with the\n\
     replacement repl.");
@@ -3579,14 +3579,54 @@ match_deepcopy(MatchObject* self, PyObject* memo)
 #endif
 }
 
+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\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\n\
+    Return index of the start of the substring matched by group.");
+
+PyDoc_STRVAR(match_end_doc,
+"end([group=0]) -> int.\n\n\
+    Return index of the end of the substring matched by group.");
+
+PyDoc_STRVAR(match_span_doc,
+"span([group]) -> tuple.\n\n\
+    For MatchObject m, return the 2-tuple (m.start(group), m.end(group)).");
+
+PyDoc_STRVAR(match_groups_doc,
+"groups([default=None]) -> tuple.\n\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\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\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},
-    {"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},
+    {"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}
@@ -3665,7 +3705,7 @@ static PyTypeObject Match_Type = {
     0,				/* tp_setattro */
     0,				/* tp_as_buffer */
     Py_TPFLAGS_DEFAULT,		/* tp_flags */
-    0,				/* tp_doc */
+    match_doc,			/* tp_doc */
     0,				/* tp_traverse */
     0,				/* tp_clear */
     0,				/* tp_richcompare */