[docs] [issue27720] decimal.Context.to_eng_string wrong docstring

[Evelyn Mitchell]

Evelyn Mitchell added the comment:

Thank you Raymond for a detailed patch update. 

I will mention that matlab does not support this conversion [1]. R doesn't support engineering notation, either.

It may be that this conversion isn't expected to be part of the standard library, and people are more likely to write their own. [2]

The rationale for engineering notation is that it corresponds to SI units of measure.

[1] https://www.mathworks.com/matlabcentral/newsreader/view_thread/22843
[2] http://stackoverflow.com/questions/8262302/python-fixed-exponent-in-scientific-notation

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