bpo-46852: Remove the float.__set_format__() method (GH-31585)

Remove the undocumented private float.__set_format__() method,
previously known as float.__set_format__() in Python 3.7. Its
docstring said: "You probably don't want to use this function. It
exists mainly to be used in Python's test suite."

1 files changed, 2 insertions, 74 deletions

diff --git a/Objects/floatobject.c b/Objects/floatobject.c
index 342e768..91ca848 100644
--- a/Objects/floatobject.c
+++ b/Objects/floatobject.c
@@ -1708,7 +1708,6 @@ typedef enum {
 } float_format_type;
 
 static float_format_type double_format, float_format;
-static float_format_type detected_double_format, detected_float_format;
 
 /*[clinic input]
 @classmethod
@@ -1760,78 +1759,6 @@ float___getformat___impl(PyTypeObject *type, const char *typestr)
     }
 }
 
-/*[clinic input]
-@classmethod
-float.__setformat__
-
-    typestr: str
-        Must be 'double' or 'float'.
-    fmt: str
-        Must be one of 'unknown', 'IEEE, big-endian' or 'IEEE, little-endian',
-        and in addition can only be one of the latter two if it appears to
-        match the underlying C reality.
-    /
-
-You probably don't want to use this function.
-
-It exists mainly to be used in Python's test suite.
-
-Override the automatic determination of C-level floating point type.
-This affects how floats are converted to and from binary strings.
-[clinic start generated code]*/
-
-static PyObject *
-float___setformat___impl(PyTypeObject *type, const char *typestr,
-                         const char *fmt)
-/*[clinic end generated code: output=06864de1fb5f1f04 input=c0e9e04dd87f9988]*/
-{
-    float_format_type f;
-    float_format_type detected;
-    float_format_type *p;
-
-    if (strcmp(typestr, "double") == 0) {
-        p = &double_format;
-        detected = detected_double_format;
-    }
-    else if (strcmp(typestr, "float") == 0) {
-        p = &float_format;
-        detected = detected_float_format;
-    }
-    else {
-        PyErr_SetString(PyExc_ValueError,
-                        "__setformat__() argument 1 must "
-                        "be 'double' or 'float'");
-        return NULL;
-    }
-
-    if (strcmp(fmt, "unknown") == 0) {
-        f = unknown_format;
-    }
-    else if (strcmp(fmt, "IEEE, little-endian") == 0) {
-        f = ieee_little_endian_format;
-    }
-    else if (strcmp(fmt, "IEEE, big-endian") == 0) {
-        f = ieee_big_endian_format;
-    }
-    else {
-        PyErr_SetString(PyExc_ValueError,
-                        "__setformat__() argument 2 must be "
-                        "'unknown', 'IEEE, little-endian' or "
-                        "'IEEE, big-endian'");
-        return NULL;
-
-    }
-
-    if (f != unknown_format && f != detected) {
-        PyErr_Format(PyExc_ValueError,
-                     "can only set %s format to 'unknown' or the "
-                     "detected platform value", typestr);
-        return NULL;
-    }
-
-    *p = f;
-    Py_RETURN_NONE;
-}
 
 static PyObject *
 float_getreal(PyObject *v, void *closure)
@@ -1885,7 +1812,6 @@ static PyMethodDef float_methods[] = {
     FLOAT_IS_INTEGER_METHODDEF
     FLOAT___GETNEWARGS___METHODDEF
     FLOAT___GETFORMAT___METHODDEF
-    FLOAT___SETFORMAT___METHODDEF
     FLOAT___FORMAT___METHODDEF
     {NULL,              NULL}           /* sentinel */
 };
@@ -1989,6 +1915,8 @@ _PyFloat_InitState(PyInterpreterState *interp)
         return;
     }
 
+    float_format_type detected_double_format, detected_float_format;
+
     /* We attempt to determine if this machine is using IEEE
        floating point formats by peering at the bits of some
        carefully chosen values.  If it looks like we are on an