bug#32042: 26.1; python.el with ipython prompt leads to superfluous interactive shell output

[Noam Postavsky]

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> --- Begin Message ---
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> Subject: 
>
> Re: bug#32042: 26.1; python.el with ipython prompt leads to superfluous interactive shell output
>
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> Date: 
>
> Fri, 6 Jul 2018 12:21:52 -0700 (PDT)
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> There was no change; I still see the broken output in the original post...
>
> ```File "<ipython-input-1-57ce0cd600e5>", line 1, in <module>
>     import codecs, os;__pyfile = 
> codecs.open('''/var/folders/qr/s_h2rhqj6kdg8qrj0zw2scnw0000gn/T/pyLbk6Vh''', 
> encoding='''utf-8''')
> ```
>
> I tried:
>
> Disabling system integrity protection (booting into OS X High Sierra recovery 
> mode and running `csrutil disable`), then 
>
> ```
> cd 
> /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload
>  
> sudo mv readline.so readline.so.bak
> ```
>
> and the same for the anaconda readline:
>
> ```
> cd /usr/local/anaconda3/lib/python3.6/lib-dynload
> mv readline.cpython-36m-darwin.so readline.cpython-36m-darwin.so.bak
> ```
>
> And installing gnureadline.
>
> Still getting the same broken output.
> forwarding to list
> Any other ideas?
>
> --- End Message ---

Try in a python shell:

    print (readline.__doc__)
    print (readline.__file__)

The first to confirm that libedit readline is still being loaded, the
second to hopefully give some kind of hint where it's coming from.