Thomas Kluyver <[email protected]> added the comment:
I'm still a bit confused why it gets escaped - as far as I know, the escaping
only happens when you repr() a string, as the displayhook does automatically:
>>> a = """ a ' single and " double quote """
>>> a
' a \' single and " double quote '
>>> print(repr(a))
' a \' single and " double quote '
>>> print("%r" % a)
' a \' single and " double quote '
>>> print(a)
a ' single and " double quote
The warnings code doesn't appear to ever repr() the message. So I guess it's
some further bit of interaction with doctest. But unfortunately I don't have
time to dig through doctest to try and understand it.
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<https://bugs.python.org/issue36695>
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