Issue #9416: Fix some issues with complex formatting where the
output with no type specifier failed to match the str output:
- format(complex(-0.0, 2.0), '-') omitted the real part from the output,
- format(complex(0.0, 2.0), '-') included a sign and parentheses.
diff --git a/Lib/test/test_complex.py b/Lib/test/test_complex.py
index cecf38f..1564e89 100644
--- a/Lib/test/test_complex.py
+++ b/Lib/test/test_complex.py
@@ -506,6 +506,16 @@
self.assertEqual(format(z, '-'), str(z))
self.assertEqual(format(z, '<'), str(z))
self.assertEqual(format(z, '10'), str(z))
+ z = complex(0.0, 3.0)
+ self.assertEqual(format(z, ''), str(z))
+ self.assertEqual(format(z, '-'), str(z))
+ self.assertEqual(format(z, '<'), str(z))
+ self.assertEqual(format(z, '2'), str(z))
+ z = complex(-0.0, 2.0)
+ self.assertEqual(format(z, ''), str(z))
+ self.assertEqual(format(z, '-'), str(z))
+ self.assertEqual(format(z, '<'), str(z))
+ self.assertEqual(format(z, '3'), str(z))
self.assertEqual(format(1+3j, 'g'), '1+3j')
self.assertEqual(format(3j, 'g'), '0+3j')
diff --git a/Misc/NEWS b/Misc/NEWS
index 96ff051..eb4fdca 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,12 @@
Core and Builtins
-----------------
+- Issue #9416: Fix some issues with complex formatting where the
+ output with no type specifier failed to match the str output:
+
+ - format(complex(-0.0, 2.0), '-') omitted the real part from the output,
+ - format(complex(0.0, 2.0), '-') included a sign and parentheses.
+
Library
-------
diff --git a/Objects/stringlib/formatter.h b/Objects/stringlib/formatter.h
index ba2a251..ab57a82 100644
--- a/Objects/stringlib/formatter.h
+++ b/Objects/stringlib/formatter.h
@@ -1136,9 +1136,10 @@
/* Omitted type specifier. Should be like str(self). */
type = 'g';
default_precision = PyFloat_STR_PRECISION;
- add_parens = 1;
- if (re == 0.0)
+ if (re == 0.0 && copysign(1.0, re) == 1.0)
skip_re = 1;
+ else
+ add_parens = 1;
}
if (type == 'n')
@@ -1223,8 +1224,11 @@
n_re_digits, n_re_remainder,
re_has_decimal, &locale, &tmp_format);
- /* Same formatting, but always include a sign. */
- tmp_format.sign = '+';
+ /* Same formatting, but always include a sign, unless the real part is
+ * going to be omitted, in which case we use whatever sign convention was
+ * requested by the original format. */
+ if (!skip_re)
+ tmp_format.sign = '+';
n_im_total = calc_number_widths(&im_spec, 0, im_sign_char, p_im,
n_im_digits, n_im_remainder,
im_has_decimal, &locale, &tmp_format);