diff --git a/Lib/test/multibytecodec_support.py b/Lib/test/multibytecodec_support.py
index cca8af67d6d1d6cc65f586517981b3a04aaf865d..f76c0153f5ecf7295c2536586f87cc72d5e12342 100644
--- a/Lib/test/multibytecodec_support.py
+++ b/Lib/test/multibytecodec_support.py
@@ -305,29 +305,23 @@ def test_mapping_file(self):
             self._test_mapping_file_plain()
 
     def _test_mapping_file_plain(self):
-        unichrs = lambda s: ''.join(map(chr, map(eval, s.split('+'))))
+        def unichrs(s):
+            return ''.join(chr(int(x, 16)) for x in s.split('+'))
+
         urt_wa = {}
 
         with self.open_mapping_file() as f:
             for line in f:
                 if not line:
                     break
-                data = line.split('#')[0].strip().split()
+                data = line.split('#')[0].split()
                 if len(data) != 2:
                     continue
 
-                csetval = eval(data[0])
-                if csetval <= 0x7F:
-                    csetch = bytes([csetval & 0xff])
-                elif csetval >= 0x1000000:
-                    csetch = bytes([(csetval >> 24), ((csetval >> 16) & 0xff),
-                                    ((csetval >> 8) & 0xff), (csetval & 0xff)])
-                elif csetval >= 0x10000:
-                    csetch = bytes([(csetval >> 16), ((csetval >> 8) & 0xff),
-                                    (csetval & 0xff)])
-                elif csetval >= 0x100:
-                    csetch = bytes([(csetval >> 8), (csetval & 0xff)])
-                else:
+                if data[0][:2] != '0x':
+                    self.fail(f"Invalid line: {line!r}")
+                csetch = bytes.fromhex(data[0][2:])
+                if len(csetch) == 1 and 0x80 <= csetch[0]:
                     continue
 
                 unich = unichrs(data[1])
diff --git a/Lib/test/test_ucn.py b/Lib/test/test_ucn.py
index 8febf0af8627b41f6f752e4e791291da1f08d107..69973706416f914cdbea3439ad3241597c3e1cc5 100644
--- a/Lib/test/test_ucn.py
+++ b/Lib/test/test_ucn.py
@@ -7,6 +7,7 @@
 
 """#"
 
+import ast
 import unittest
 import unicodedata
 
@@ -25,7 +26,7 @@ def checkletter(self, name, code):
         # Helper that put all \N escapes inside eval'd raw strings,
         # to make sure this script runs even if the compiler
         # chokes on \N escapes
-        res = eval(r'"\N{%s}"' % name)
+        res = ast.literal_eval(r'"\N{%s}"' % name)
         self.assertEqual(res, code)
         return res