[issue45218] cmath.log has an invalid signature

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

See also #36306 and #29299. There may be nothing to be done here, but it would be nice if math.log and cmath.log at least behaved in the same way. A default of `None` doesn't seem like a terrible option.

(BTW, just to forestall the suggestion, a default of `math.e` or `cmath.e` is definitely *not* the right thing to use as a default: `math.e` is not exactly Euler's value for e, and `log` base `math.e` is likely to be less accurate than plain natural log.)

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<https://bugs.python.org/issue45218>
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