Fix mypy error by being more explicit and verbose

IPython/core/magics/basic.py

@@ -297,7 +297,10 b' Currently the magic system has the following functions:""",'
         oname = args and args or '_'
         info = self.shell._ofind(oname)
         if info['found']:
-            txt = (raw and str or pformat)( info['obj'] )
+            if raw:
+                txt = str(info["obj"])
+            else:
+                txt = pformat(info["obj"])
             page.page(txt)
         else:
             print('Object `%s` not found' % oname)