How to control indentation after an open parenthesis in Emacs

Question

When I use emacs python-mode, if the last character of a line is an open parenthesis it indents the next line just one step in from the indentation of the previous line.

Answer 1

Thank you Török Gábor, in my case I prefered to set

(add-hook 'XXX-mode-hook
      (lambda ()
              (c-set-offset 'arglist-cont-nonempty '+)))

I was looking for something like this :

veryLongFunctionName (bar, bar, bar)

For a more exhaustive list of variables : read emacs documentation