Issue #7094: Add alternate ('#') flag to __format__ methods for float, complex and Decimal. Allows greater control over when decimal points appear. Added to make transitioning from %-formatting easier. '#g' still has a problem with Decimal which I'll fix soon.
diff --git a/Objects/stringlib/formatter.h b/Objects/stringlib/formatter.h
index 4fdab06..4fdc62d 100644
--- a/Objects/stringlib/formatter.h
+++ b/Objects/stringlib/formatter.h
@@ -941,13 +941,8 @@
from a hard-code pseudo-locale */
LocaleInfo locale;
- /* Alternate is not allowed on floats. */
- if (format->alternate) {
- PyErr_SetString(PyExc_ValueError,
- "Alternate form (#) not allowed in float format "
- "specifier");
- goto done;
- }
+ if (format->alternate)
+ flags |= Py_DTSF_ALT;
if (type == '\0') {
/* Omitted type specifier. Behaves in the same way as repr(x)
@@ -1104,15 +1099,7 @@
from a hard-code pseudo-locale */
LocaleInfo locale;
- /* Alternate is not allowed on complex. */
- if (format->alternate) {
- PyErr_SetString(PyExc_ValueError,
- "Alternate form (#) not allowed in complex format "
- "specifier");
- goto done;
- }
-
- /* Neither is zero pading. */
+ /* Zero padding is not allowed. */
if (format->fill_char == '0') {
PyErr_SetString(PyExc_ValueError,
"Zero padding is not allowed in complex format "
@@ -1135,6 +1122,9 @@
if (im == -1.0 && PyErr_Occurred())
goto done;
+ if (format->alternate)
+ flags |= Py_DTSF_ALT;
+
if (type == '\0') {
/* Omitted type specifier. Should be like str(self). */
type = 'r';