python - 将交互式 python 中的默认 repr 从 builtins.repr 更改为 reprlib.repr

Question

在交互式 Python 提示符下，当我不将表达式的输出绑定foo到名称时，Python 会将 的输出写入builtins.repr(foo)终端。

在较新版本的 Python 中，存在一种替代repr实现，它不会在屏幕上显示具有长字符串表示的对象，如下所示：

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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'

我可以以某种方式告诉 Python 在交互式提示中使用reprlib.repr而不是builtin.repr表示未分配的输出吗？我最好对适用于任何 Python shell 的答案感兴趣，或者对至少适用于 IPython 的答案感兴趣。

Answer 1

您正在寻找的可能是sys.display_hook： http: //docs.python.org/2/library/sys.html#sys.displayhook。