Prevent crashing when processing ``enums`` with mixed single and double quotes.

Close PyCQA/pylint#2676

2 files changed, 25 insertions, 1 deletions

diff --git a/astroid/brain/brain_namedtuple_enum.py b/astroid/brain/brain_namedtuple_enum.py
index 6dc07f5e..58402f18 100644
--- a/astroid/brain/brain_namedtuple_enum.py
+++ b/astroid/brain/brain_namedtuple_enum.py
@@ -322,7 +322,7 @@ def infer_enum_class(node):
             inferred_return_value = None
             if isinstance(stmt.value, nodes.Const):
                 if isinstance(stmt.value.value, str):
-                    inferred_return_value = '"{}"'.format(stmt.value.value)
+                    inferred_return_value = repr(stmt.value.value)
                 else:
                     inferred_return_value = stmt.value.value
 
diff --git a/astroid/tests/unittest_brain.py b/astroid/tests/unittest_brain.py
index 55936009..5b9c68b8 100644
--- a/astroid/tests/unittest_brain.py
+++ b/astroid/tests/unittest_brain.py
@@ -740,6 +740,30 @@ class EnumBrainTest(unittest.TestCase):
             isinstance(elem, astroid.Const) and elem.value == 1 for elem in inferred_int
         )
 
+    def test_mingled_single_and_double_quotes_does_not_crash(self):
+        node = builder.extract_node(
+            """
+        from enum import Enum
+        class A(Enum):
+            a = 'x"y"'
+        A.a.value #@
+        """
+        )
+        inferred_string = next(node.infer())
+        assert inferred_string.value == 'x"y"'
+
+    def test_special_characters_does_not_crash(self):
+        node = builder.extract_node(
+            """
+        import enum
+        class Example(enum.Enum):
+            NULL = '\\N{NULL}'
+        Example.NULL.value
+        """
+        )
+        inferred_string = next(node.infer())
+        assert inferred_string.value == "\N{NULL}"
+
 
 @unittest.skipUnless(HAS_DATEUTIL, "This test requires the dateutil library.")
 class DateutilBrainTest(unittest.TestCase):