[docs] [issue30361] Docs example: converting mixed types to floating point

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

Sorry, I don't know whether this was a sprint project or not.]
Saw that the original PR has sprint label on it, I merely copied them over to the backport PRs.

Thanks.

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<http://bugs.python.org/issue30361>
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