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 提示符上，当我没有将表达式 foo 的输出绑定(bind)到名称时，Python 将写入 builtins.repr(foo) 的输出> 到终端。

在较新版本的 Python 中，存在 an alternative repr implementation对于具有长字符串表示形式的对象，不会淹没屏幕，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使用reprlib.repr而不是builtin.repr来表示交互式提示中未分配的输出吗？我更感兴趣的是适用于任何 Python shell 的答案，或者至少适用于 IPython 的答案。

Answer 1

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