Fix fastai#2499

fastai/core.py

@@ -179,7 +179,7 @@ def series2cat(df:DataFrame, *col_names):
 class ItemBase():
     "Base item type in the fastai library."
     def __init__(self, data:Any): self.data=self.obj=data
-    def __repr__(self)->str: return f'{self.__class__.__name__} {str(self)}'
+    def __repr__(self)->str: return f'{self.__class__.__name__} {str(self.data)}'
     def show(self, ax:plt.Axes, **kwargs):
         "Subclass this method if you want to customize the way this `ItemBase` is shown on `ax`."
         ax.set_title(str(self))
@@ -192,7 +192,7 @@ def __eq__(self, other): return recurse_eq(self.data, other.data)
 def recurse_eq(arr1, arr2):
     if is_listy(arr1): return is_listy(arr2) and len(arr1) == len(arr2) and np.all([recurse_eq(x,y) for x,y in zip(arr1,arr2)])
     else:              return np.all(np.atleast_1d(arr1 == arr2))
-        
+
 def download_url(url:str, dest:str, overwrite:bool=False, pbar:ProgressBar=None,
                  show_progress=True, chunk_size=1024*1024, timeout=4, retries=5)->None:
     "Download `url` to `dest` unless it exists and not `overwrite`."