Set variable in derived mode before running the parent mode function

[Philipp Stephani]

Hi,

I've defined a derived major mode of `python-mode' using
`define-derived-mode'.  However, some of the variables set by
`python-mode' are inappropriate for the derived mode; in particular, I'd
like to disable auto-guessing of the indentation by setting
`python-indent-guess-indent-offset' to nil.  However,
`define-derived-mode' has no customization point for running code before
the parent mode function.  What's the best way to solve this?  Using an
advice?  Or not using `define-derived-mode' in the first place?

Thanks,
Philipp

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