Terry J. Reedy <tjre...@udel.edu> added the comment:
I have an alternate replacement: "These lines can be confusing if the
sequences contain tab characters or other characters that result in the
indicator symbols in these lines being mislocated."
Or leave the current sentence as is.
Explanation with the details omitted from the above:
In 3.x, strings are unicode. Even if one uses a fixed pitch font for the ascii
subset, a majority of characters will be rendered either in a different fixed
pitch or with variable pitch. And on a graphics screen that is not simulating
a fixed-pitch text terminal (such as Windows console), the so-called
double-wide East Asian characters are not really double wide but more like 1.6
times as wide. The details depend on the OS, the font, and perhaps the font
size. One can explore this in the font sample box for the Font tab of the IDLE
settings dialog. The problems include chars less than 'one space', down to 0
wide. For general unicode, ^ marking does not work. Syntax error marking has
the same problem and there is no general solution.
Tab is an example of a character that is either displayed as a variable space
or a fixed double space ('\t') or larger. If we were to make a change, we
should mention, as above, that many non-ascii chars are as especially confusing
as tabs.
In your example above, the caret at least points to the right space. It
correctly indicates some difference beyond the visible end - a non-visible
whitespace difference.
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<https://bugs.python.org/issue43689>
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