[issue43025] Use normal 'i' character to denote imaginary part of complex numbers

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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versions: +Python 3.10 -Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43025>
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