bpo-38431: Fix __repr__ method of InitVar to work with typing objects. (GH-16702)

1 files changed, 6 insertions, 1 deletions

diff --git a/Lib/dataclasses.py b/Lib/dataclasses.py
index 9135b07c9f..91c1f6f80f 100644
--- a/Lib/dataclasses.py
+++ b/Lib/dataclasses.py
@@ -206,7 +206,12 @@ class InitVar:
         self.type = type
 
     def __repr__(self):
-        return f'dataclasses.InitVar[{self.type.__name__}]'
+        if isinstance(self.type, type):
+            type_name = self.type.__name__
+        else:
+            # typing objects, e.g. List[int]
+            type_name = repr(self.type)
+        return f'dataclasses.InitVar[{type_name}]'
 
     def __class_getitem__(cls, type):
         return InitVar(type)