[issue30190] unittest's assertAlmostEqual improved error message

[Giampaolo Rodola']

Giampaolo Rodola' added the comment:

Thanks for chiming in.

> Is it worth to output a difference when the delta argument is not passed?

Yes, probably. I will change that.

> Is it worth to output a signed difference rather than an absolute value?

Mmmm probably not IMHO. Personally I never care about the position of left and right arguments. I just want to check whether a and b are almost equal.

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