[docs] Python's bugs on numerical calculation

[赵世忠]

To whom it may concern,

    Hello, I am Shizhong Zhao, and work at East China Normal University. My major is Computer Arithmetic. I know that numerical calculation is unstable in most of the softwares. 

   Please read the attachment.

Yours Sincerely,
Shizhong Zhao



----------------Here is an error-controlled calculator： http://www.zhaoshizhong.org/download.htm
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/docs/attachments/20180326/8a436609/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: final.pdf
Type: application/pdf
Size: 380650 bytes
Desc: not available
URL: <http://mail.python.org/pipermail/docs/attachments/20180326/8a436609/attachment-0001.pdf>