Fixing format string in pandas/tests/extension/list/array.py (#30412)

AncientRickles · jbrockmendel · commit d0bb0099f5a5 · 2019-12-22T17:14:17.000-08:00
diff --git a/pandas/tests/extension/list/array.py b/pandas/tests/extension/list/array.py
@@ -36,7 +36,7 @@ def construct_from_string(cls, string):
         if string == cls.name:
             return cls()
         else:
-            raise TypeError("Cannot construct a '{}' from '{}'".format(cls, string))
+            raise TypeError(f"Cannot construct a '{cls}' from '{string}'")
 
 
 class ListArray(ExtensionArray):
