bpo-27772: Make preceding width with 0 valid in string format. (GH-11270)
Previously it was an error with confusing error message.
diff --git a/Python/formatter_unicode.c b/Python/formatter_unicode.c
index ed95f26..5ccf9d3 100644
--- a/Python/formatter_unicode.c
+++ b/Python/formatter_unicode.c
@@ -219,7 +219,7 @@ parse_internal_render_format_spec(PyObject *format_spec,
/* The special case for 0-padding (backwards compat) */
if (!fill_char_specified && end-pos >= 1 && READ_spec(pos) == '0') {
format->fill_char = '0';
- if (!align_specified) {
+ if (!align_specified && default_align == '>') {
format->align = '=';
}
++pos;