allow disable pprint

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Fixed an edge case bug when console module try to detect if they are in a tty at the end of a pytest run
 - Fixed issue with TERM env vars that have more than one hyphen https://github.com/willmcgugan/rich/issues/1640
+- Fixed exception in IPython when disabling pprint with %pprint https://github.com/willmcgugan/rich/issues/1646
 
 ## [10.12.0] - 2021-10-06
 

rich/pretty.py

@@ -166,9 +166,17 @@ def install(
         ip = get_ipython()  # type: ignore
         from IPython.core.formatters import BaseFormatter
 
+        class RichFormatter(BaseFormatter):
+            pprint: bool = True
+
+            def __call__(self, value: Any) -> Any:
+                if self.pprint:
+                    return ipy_display_hook(value)
+                else:
+                    return repr(value)
+
         # replace plain text formatter with rich formatter
-        rich_formatter = BaseFormatter()
-        rich_formatter.for_type(object, func=ipy_display_hook)
+        rich_formatter = RichFormatter()
         ip.display_formatter.formatters["text/plain"] = rich_formatter
     except Exception:
         sys.displayhook = display_hook