將交互式python中的默認repr從builtins.repr更改爲reprlib.repr

Question

在交互式Python提示符下，當我不將表達式foo的輸出綁定到名稱時，Python會將builtins.repr(foo)的輸出寫入終端。

在Python的新版本，存在an alternative repr implementation不會與一個長的字符串表示充斥屏幕的物體，就像這樣：

In [297]: import random, string, reprlib 

In [298]: long_str = ''.join(random.choice(string.ascii_letters) for _ in range(1000)) 

In [299]: print(repr(long_str)) 
'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' 

In [300]: print(reprlib.repr(long_str)) 
'LcOKLSfEifoh...CKmpTICujAJsA' 

In [301]: long_str 
Out[301]: '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' 

我能以某種方式告訴Python使用reprlib.repr，而不是builtin.repr爲代表交互式提示中未分配的輸出？我最好對可以在任何Python shell中工作的答案感興趣，或者至少在IPython工作的答案中。

Answer 1

你在找什麼可能是sys.display_hook：http://docs.python.org/2/library/sys.html#sys.displayhook。