Yes, it is a bug.
I opened https://trac.sagemath.org/ticket/29621

On Wed, Apr 29, 2020 at 10:02 PM Jin Guu <jcgu...@gmail.com> wrote:
>
> Apology for more stupid questions. I imported and it loaded, but still failed:
>
> sage: from sage.misc.log import log_html
> sage: log_html
> <class 'sage.misc.log.log_html'>
> sage: log_html()
> ---------------------------------------------------------------------------
> AttributeError                            Traceback (most recent call last)
> <ipython-input-30-a8d814def110> in <module>
> ----> 1 log_html()
>
> /usr/lib/python3.8/site-packages/sage/misc/log.py in __init__(self, dir, 
> debug, viewer)
>      97         self._dir = dir
>      98         self._filename = os.path.join(dir, self._filename())
> ---> 99         self._output = __IPYTHON__.output_hist
>     100         self._input  = __IPYTHON__.input_hist_raw
>     101         self._text = ''
>
> AttributeError: 'bool' object has no attribute 'output_hist'
> sage:
>
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