[docs] [issue27155] '-' sign typo in example

[Emanuel Barry]

Emanuel Barry added the comment:

A negative return code generally means an error occurred. Negating retcode here is equivalent to abs(retcode), which shows you want a positive integer to appear in the message - it's not an error.

Could replace '-retcode' with 'abs(retcode)' to be more clear. Possibly also add a comment in the code example body to further clarify this.

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nosy: +ebarry

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27155>
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