Issue #3382. float 'F' formatting no longer maps to 'f'. This only affects nan and inf.

3 files changed, 32 insertions, 0 deletions

diff --git a/Lib/test/test_complex.py b/Lib/test/test_complex.py
index 1593f7b..43282d6 100644
--- a/Lib/test/test_complex.py
+++ b/Lib/test/test_complex.py
@@ -507,6 +507,24 @@ class ComplexTest(unittest.TestCase):
         # make sure everything works in ''.format()
         self.assertEqual('*{0:.3f}*'.format(3.14159+2.71828j), '*3.142+2.718j*')
 
+        # issue 3382
+        self.assertEqual(format(complex(NAN, NAN), 'f'), 'nan+nanj')
+        self.assertEqual(format(complex(1, NAN), 'f'), '1.000000+nanj')
+        self.assertEqual(format(complex(NAN, 1), 'f'), 'nan+1.000000j')
+        self.assertEqual(format(complex(NAN, -1), 'f'), 'nan-1.000000j')
+        self.assertEqual(format(complex(NAN, NAN), 'F'), 'NAN+NANj')
+        self.assertEqual(format(complex(1, NAN), 'F'), '1.000000+NANj')
+        self.assertEqual(format(complex(NAN, 1), 'F'), 'NAN+1.000000j')
+        self.assertEqual(format(complex(NAN, -1), 'F'), 'NAN-1.000000j')
+        self.assertEqual(format(complex(INF, INF), 'f'), 'inf+infj')
+        self.assertEqual(format(complex(1, INF), 'f'), '1.000000+infj')
+        self.assertEqual(format(complex(INF, 1), 'f'), 'inf+1.000000j')
+        self.assertEqual(format(complex(INF, -1), 'f'), 'inf-1.000000j')
+        self.assertEqual(format(complex(INF, INF), 'F'), 'INF+INFj')
+        self.assertEqual(format(complex(1, INF), 'F'), '1.000000+INFj')
+        self.assertEqual(format(complex(INF, 1), 'F'), 'INF+1.000000j')
+        self.assertEqual(format(complex(INF, -1), 'F'), 'INF-1.000000j')
+
 def test_main():
     support.run_unittest(ComplexTest)
 
diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
index b617fa3..c259d4f 100644
--- a/Lib/test/test_float.py
+++ b/Lib/test/test_float.py
@@ -320,6 +320,12 @@ class FormatTestCase(unittest.TestCase):
                 self.assertRaises(ValueError, format, 1e-100, format_spec)
                 self.assertRaises(ValueError, format, -1e-100, format_spec)
 
+        # issue 3382
+        self.assertEqual(format(NAN, 'f'), 'nan')
+        self.assertEqual(format(NAN, 'F'), 'NAN')
+        self.assertEqual(format(INF, 'f'), 'inf')
+        self.assertEqual(format(INF, 'F'), 'INF')
+
     @unittest.skipUnless(float.__getformat__("double").startswith("IEEE"),
                          "test requires IEEE 754 doubles")
     def test_format_testfile(self):
diff --git a/Lib/test/test_unicode.py b/Lib/test/test_unicode.py
index 21bb922..3ede057 100644
--- a/Lib/test/test_unicode.py
+++ b/Lib/test/test_unicode.py
@@ -779,6 +779,14 @@ class UnicodeTest(
                 return '\u1234'
         self.assertEqual('%s' % Wrapper(), '\u1234')
 
+        # issue 3382
+        NAN = float('nan')
+        INF = float('inf')
+        self.assertEqual('%f' % NAN, 'nan')
+        self.assertEqual('%F' % NAN, 'NAN')
+        self.assertEqual('%f' % INF, 'inf')
+        self.assertEqual('%F' % INF, 'INF')
+
     @support.run_with_locale('LC_ALL', 'de_DE', 'fr_FR')
     def test_format_float(self):
         # should not format with a comma, but always with C locale