On Saturday, July 11, 2020 at 3:31:15 AM UTC+9 John H Palmieri wrote:
> Does IPython have a preparser?
>
I suspected Sage's preparser. I was wrong. You are right: (even out of Sage)
Hera:~$ PYTHONWARNINGS=always ipython
Python 3.8.3 (default, May 27 2020, 20:54:22)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.15.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]: '\i'
<input>:1: DeprecationWarning: invalid escape sequence \i
<input>:1: DeprecationWarning: invalid escape sequence \i
<input>:1: DeprecationWarning: invalid escape sequence \i
<>:1: DeprecationWarning: invalid escape sequence \i
<ipython-input-1-aeb68ac32d93>:1: DeprecationWarning: invalid escape
sequence \i
'\i'
Out[1]: '\\i'
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