gh-111999: Add signatures and improve docstrings for builtins (GH-112000)

Lib/test/test_inspect/test_inspect.py

@@ -4734,12 +4734,13 @@ def test_builtins_have_signatures(self):
         needs_null = {"anext"}
         no_signature |= needs_null
         # These need *args support in Argument Clinic
-        needs_varargs = {"breakpoint", "min", "max", "__build_class__"}
+        needs_varargs = {"min", "max", "__build_class__"}
         no_signature |= needs_varargs
         # These builtin types are expected to provide introspection info
         types_with_signatures = {
-            'complex', 'enumerate', 'float', 'list', 'memoryview', 'object',
-            'property', 'reversed', 'tuple',
+            'bool', 'classmethod', 'complex', 'enumerate', 'filter', 'float',
+            'frozenset', 'list', 'map', 'memoryview', 'object', 'property',
+            'reversed', 'set', 'staticmethod', 'tuple', 'zip'
         }
         # Check the signatures we expect to be there
         ns = vars(builtins)
@@ -4753,6 +4754,10 @@ def test_builtins_have_signatures(self):
             if (name in no_signature):
                 # Not yet converted
                 continue
+            if name in {'classmethod', 'staticmethod'}:
+                # Bug gh-112006: inspect.unwrap() does not work with types
+                # with the __wrapped__ data descriptor.
+                continue
             with self.subTest(builtin=name):
                 self.assertIsNotNone(inspect.signature(obj))
         # Check callables that haven't been converted don't claim a signature

Objects/boolobject.c

@@ -110,9 +110,10 @@ bool_xor(PyObject *a, PyObject *b)
 /* Doc string */
 
 PyDoc_STRVAR(bool_doc,
-"bool(x) -> bool\n\
+"bool(object=False, /)\n\
+--\n\
 \n\
-Returns True when the argument x is true, False otherwise.\n\
+Returns True when the argument is true, False otherwise.\n\
 The builtins True and False are the only two instances of the class bool.\n\
 The class bool is a subclass of the class int, and cannot be subclassed.");
 

Objects/descrobject.c

@@ -1541,6 +1541,9 @@ property_deleter(PyObject *self, PyObject *deleter)
 
 
 PyDoc_STRVAR(set_name_doc,
+             "__set_name__($self, owner, name, /)\n"
+             "--\n"
+             "\n"
              "Method to set name of a property.");
 
 static PyObject *

Objects/funcobject.c

@@ -1164,7 +1164,8 @@ cm_repr(classmethod *cm)
 }
 
 PyDoc_STRVAR(classmethod_doc,
-"classmethod(function) -> method\n\
+"classmethod(function, /)\n\
+--\n\
 \n\
 Convert a function to be a class method.\n\
 \n\
@@ -1359,7 +1360,8 @@ sm_repr(staticmethod *sm)
 }
 
 PyDoc_STRVAR(staticmethod_doc,
-"staticmethod(function) -> method\n\
+"staticmethod(function, /)\n\
+--\n\
 \n\
 Convert a function to be a static method.\n\
 \n\

Objects/setobject.c

@@ -942,7 +942,10 @@ set_update(PySetObject *so, PyObject *args)
 }
 
 PyDoc_STRVAR(update_doc,
-"Update a set with the union of itself and others.");
+"update($self, /, *others)\n\
+--\n\
+\n\
+Update the set, adding elements from all others.");
 
 /* XXX Todo:
    If aligned memory allocations become available, make the
@@ -1141,9 +1144,10 @@ set_union(PySetObject *so, PyObject *args)
 }
 
 PyDoc_STRVAR(union_doc,
- "Return the union of sets as a new set.\n\
+"union($self, /, *others)\n\
+--\n\
 \n\
-(i.e. all elements that are in either set.)");
+Return a new set with elements from the set and all others.");
 
 static PyObject *
 set_or(PySetObject *so, PyObject *other)
@@ -1281,9 +1285,10 @@ set_intersection_multi(PySetObject *so, PyObject *args)
 }
 
 PyDoc_STRVAR(intersection_doc,
-"Return the intersection of two sets as a new set.\n\
+"intersection($self, /, *others)\n\
+--\n\
 \n\
-(i.e. all elements that are in both sets.)");
+Return a new set with elements common to the set and all others.");
 
 static PyObject *
 set_intersection_update(PySetObject *so, PyObject *other)
@@ -1312,7 +1317,10 @@ set_intersection_update_multi(PySetObject *so, PyObject *args)
 }
 
 PyDoc_STRVAR(intersection_update_doc,
-"Update a set with the intersection of itself and another.");
+"intersection_update($self, /, *others)\n\
+--\n\
+\n\
+Update the set, keeping only elements found in it and all others.");
 
 static PyObject *
 set_and(PySetObject *so, PyObject *other)
@@ -1470,7 +1478,10 @@ set_difference_update(PySetObject *so, PyObject *args)
 }
 
 PyDoc_STRVAR(difference_update_doc,
-"Remove all elements of another set from this set.");
+"difference_update($self, /, *others)\n\
+--\n\
+\n\
+Update the set, removing elements found in others.");
 
 static PyObject *
 set_copy_and_difference(PySetObject *so, PyObject *other)
@@ -1587,9 +1598,10 @@ set_difference_multi(PySetObject *so, PyObject *args)
 }
 
 PyDoc_STRVAR(difference_doc,
-"Return the difference of two or more sets as a new set.\n\
+"difference($self, /, *others)\n\
+--\n\
 \n\
-(i.e. all elements that are in this set but not the others.)");
+Return a new set with elements in the set that are not in the others.");
 static PyObject *
 set_sub(PySetObject *so, PyObject *other)
 {
@@ -1673,7 +1685,10 @@ set_symmetric_difference_update(PySetObject *so, PyObject *other)
 }
 
 PyDoc_STRVAR(symmetric_difference_update_doc,
-"Update a set with the symmetric difference of itself and another.");
+"symmetric_difference_update($self, other, /)\n\
+--\n\
+\n\
+Update the set, keeping only elements found in either set, but not in both.");
 
 static PyObject *
 set_symmetric_difference(PySetObject *so, PyObject *other)
@@ -1694,9 +1709,10 @@ set_symmetric_difference(PySetObject *so, PyObject *other)
 }
 
 PyDoc_STRVAR(symmetric_difference_doc,
-"Return the symmetric difference of two sets as a new set.\n\
+"symmetric_difference($self, other, /)\n\
+--\n\
 \n\
-(i.e. all elements that are in exactly one of the sets.)");
+Return a new set with elements in either the set or other but not both.");
 
 static PyObject *
 set_xor(PySetObject *so, PyObject *other)
@@ -2100,8 +2116,8 @@ static PyNumberMethods set_as_number = {
 };
 
 PyDoc_STRVAR(set_doc,
-"set() -> new empty set object\n\
-set(iterable) -> new set object\n\
+"set(iterable=(), /)\n\
+--\n\
 \n\
 Build an unordered collection of unique elements.");
 
@@ -2201,8 +2217,8 @@ static PyNumberMethods frozenset_as_number = {
 };
 
 PyDoc_STRVAR(frozenset_doc,
-"frozenset() -> empty frozenset object\n\
-frozenset(iterable) -> frozenset object\n\
+"frozenset(iterable=(), /)\n\
+--\n\
 \n\
 Build an immutable unordered collection of unique elements.");
 

Objects/typeobject.c

@@ -5254,8 +5254,10 @@ static PyMethodDef type_methods[] = {
     TYPE___SUBCLASSES___METHODDEF
     {"__prepare__", _PyCFunction_CAST(type_prepare),
      METH_FASTCALL | METH_KEYWORDS | METH_CLASS,
-     PyDoc_STR("__prepare__() -> dict\n"
-               "used to create the namespace for the class statement")},
+     PyDoc_STR("__prepare__($cls, name, bases, /, **kwds)\n"
+               "--\n"
+               "\n"
+               "Create the namespace for the class statement")},
     TYPE___INSTANCECHECK___METHODDEF
     TYPE___SUBCLASSCHECK___METHODDEF
     TYPE___DIR___METHODDEF

Objects/unicodeobject.c

@@ -13390,15 +13390,17 @@ _PyUnicodeWriter_Dealloc(_PyUnicodeWriter *writer)
 #include "stringlib/unicode_format.h"
 
 PyDoc_STRVAR(format__doc__,
-             "S.format(*args, **kwargs) -> str\n\
+             "format($self, /, *args, **kwargs)\n\
+--\n\
 \n\
-Return a formatted version of S, using substitutions from args and kwargs.\n\
+Return a formatted version of the string, using substitutions from args and kwargs.\n\
 The substitutions are identified by braces ('{' and '}').");
 
 PyDoc_STRVAR(format_map__doc__,
-             "S.format_map(mapping) -> str\n\
+             "format_map($self, /, mapping)\n\
+--\n\
 \n\
-Return a formatted version of S, using substitutions from mapping.\n\
+Return a formatted version of the string, using substitutions from mapping.\n\
 The substitutions are identified by braces ('{' and '}').");
 
 /*[clinic input]
@@ -14696,7 +14698,7 @@ errors is specified, then the object must expose a data buffer\n\
 that will be decoded using the given encoding and error handler.\n\
 Otherwise, returns the result of object.__str__() (if defined)\n\
 or repr(object).\n\
-encoding defaults to sys.getdefaultencoding().\n\
+encoding defaults to 'utf-8'.\n\
 errors defaults to 'strict'.");
 
 static PyObject *unicode_iter(PyObject *seq);

Python/bltinmodule.c

@@ -482,6 +482,7 @@ builtin_breakpoint(PyObject *self, PyObject *const *args, Py_ssize_t nargs, PyOb
 
 PyDoc_STRVAR(breakpoint_doc,
 "breakpoint(*args, **kws)\n\
+--\n\
 \n\
 Call sys.breakpointhook(*args, **kws).  sys.breakpointhook() must accept\n\
 whatever arguments are passed.\n\
@@ -626,7 +627,8 @@ static PyMethodDef filter_methods[] = {
 };
 
 PyDoc_STRVAR(filter_doc,
-"filter(function or None, iterable) --> filter object\n\
+"filter(function, iterable, /)\n\
+--\n\
 \n\
 Return an iterator yielding those items of iterable for which function(item)\n\
 is true. If function is None, return the items that are true.");
@@ -1449,7 +1451,8 @@ static PyMethodDef map_methods[] = {
 
 
 PyDoc_STRVAR(map_doc,
-"map(func, *iterables) --> map object\n\
+"map(function, /, *iterables)\n\
+--\n\
 \n\
 Make an iterator that computes the function using arguments from\n\
 each of the iterables.  Stops when the shortest iterable is exhausted.");
@@ -1888,7 +1891,7 @@ min(arg1, arg2, *args, *[, key=func]) -> value\n\
 With a single iterable argument, return its smallest item. The\n\
 default keyword-only argument specifies an object to return if\n\
 the provided iterable is empty.\n\
-With two or more arguments, return the smallest argument.");
+With two or more positional arguments, return the smallest argument.");
 
 
 /* AC: cannot convert yet, waiting for *args support */
@@ -1905,7 +1908,7 @@ max(arg1, arg2, *args, *[, key=func]) -> value\n\
 With a single iterable argument, return its biggest item. The\n\
 default keyword-only argument specifies an object to return if\n\
 the provided iterable is empty.\n\
-With two or more arguments, return the largest argument.");
+With two or more positional arguments, return the largest argument.");
 
 
 /*[clinic input]
@@ -2958,10 +2961,8 @@ static PyMethodDef zip_methods[] = {
 };
 
 PyDoc_STRVAR(zip_doc,
-"zip(*iterables, strict=False) --> Yield tuples until an input is exhausted.\n\
-\n\
-   >>> list(zip('abcdefg', range(3), range(4)))\n\
-   [('a', 0, 0), ('b', 1, 1), ('c', 2, 2)]\n\
+"zip(*iterables, strict=False)\n\
+--\n\
 \n\
 The zip object yields n-length tuples, where n is the number of iterables\n\
 passed as positional arguments to zip().  The i-th element in every tuple\n\
@@ -2969,7 +2970,10 @@ comes from the i-th iterable argument to zip().  This continues until the\n\
 shortest argument is exhausted.\n\
 \n\
 If strict is true and one of the arguments is exhausted before the others,\n\
-raise a ValueError.");
+raise a ValueError.\n\
+\n\
+   >>> list(zip('abcdefg', range(3), range(4)))\n\
+   [('a', 0, 0), ('b', 1, 1), ('c', 2, 2)]");
 
 PyTypeObject PyZip_Type = {
     PyVarObject_HEAD_INIT(&PyType_Type, 0)