gh-121249: adjust formatting codes for complex types in struct/ctypes (#132827)

* F - for float _Complex
* D - for double _Complex
* G - for long double _Complex (not supported by the struct module)

1 files changed, 8 insertions, 8 deletions

diff --git a/Lib/test/test_struct.py b/Lib/test/test_struct.py
index b99391e..a410fd5 100644
--- a/Lib/test/test_struct.py
+++ b/Lib/test/test_struct.py
@@ -23,7 +23,7 @@ INF = float('inf')
 NAN = float('nan')
 
 try:
-    struct.pack('C', 1j)
+    struct.pack('D', 1j)
     have_c_complex = True
 except struct.error:
     have_c_complex = False
@@ -801,23 +801,23 @@ class StructTest(ComplexesAreIdenticalMixin, unittest.TestCase):
         values = [complex(*_) for _ in combinations([1, -1, 0.0, -0.0, 2,
                                                      -3, INF, -INF, NAN], 2)]
         for z in values:
-            for f in ['E', 'C', '>E', '>C', '<E', '<C']:
+            for f in ['F', 'D', '>F', '>D', '<F', '<D']:
                 with self.subTest(z=z, format=f):
                     round_trip = struct.unpack(f, struct.pack(f, z))[0]
                     self.assertComplexesAreIdentical(z, round_trip)
 
     @unittest.skipIf(have_c_complex, "requires no C11 complex type support")
     def test_c_complex_error(self):
-        msg1 = "'E' format not supported on this system"
-        msg2 = "'C' format not supported on this system"
+        msg1 = "'F' format not supported on this system"
+        msg2 = "'D' format not supported on this system"
         with self.assertRaisesRegex(struct.error, msg1):
-            struct.pack('E', 1j)
+            struct.pack('F', 1j)
         with self.assertRaisesRegex(struct.error, msg1):
-            struct.unpack('E', b'1')
+            struct.unpack('F', b'1')
         with self.assertRaisesRegex(struct.error, msg2):
-            struct.pack('C', 1j)
+            struct.pack('D', 1j)
         with self.assertRaisesRegex(struct.error, msg2):
-            struct.unpack('C', b'1')
+            struct.unpack('D', b'1')
 
 
 class UnpackIteratorTest(unittest.TestCase):