added axvlines_color parameter to parallel_coordinates
parallel_coordinates are in pandas.tools.plotting
'black' color was hard-coded for vertical lines, I suggest to make it an option

@TomAugspurger @sinhrks ?
 No strong opinion here. It's an easy addition but I don't think our parallel coordinate plot is worth expanding.

> On Oct 11, 2015, at 10:56, Jeff Reback notifications@github.com wrote:
> 
> @TomAugspurger @sinhrks ?
> 
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> Reply to this email directly or view it on GitHub.
 should we deprecate `parallel_coordinates` ? (is their a direct replacement say in seaborn/mpl/bokeh)? can we simply dispatch?
 No replacement in seaborn / mpl. The best I've seen is [here](https://github.com/Geosyntec/wqio/pull/37/files#diff-dd00120ecd13d10566a50c6ffc3de9c4R535).
 Though we don't set a high value on maintaining other plotting funcs than `.plot` method, this kind of small fix looks OK to be applied. Otherwise, may better to deprecate it as unmaintained.
 ok can u add a test, make sure the keyworkd are added in the .plot accessor and add a whatsnew note 
 Hi guys!
Sorry for the late reply - was traveling a little bit
Thank you for considering my request!

Ehm.... how about  passing keyword arguments for avx line potting insted of
just color?
Because well, I needed another color - somebody else might need another
line thickness etc

can make it like this:

def parallel_coordinates(frame, class_column, cols=None, ax=None,
color=None,
                         use_columns=False, xticks=None, colormap=None,
                         axvlines=True,
axvlines_kwds={'linewidth':1,'color':'black'}, **kwds):

the default {'linewidth':1,'color':'black'}, ensure that backward
compatibility

Cheers!
Alex

2015-10-19 1:34 GMT+09:00 Jeff Reback notifications@github.com:

> ok can u add a test, make sure the keyworkd are added in the .plot
> accessor and add a whatsnew note
> 
> —
> Reply to this email directly or view it on GitHub
> https://github.com/pydata/pandas/pull/10709#issuecomment-149028586.
 Oh, right, I already committed this :)
Anyway, just wanted to add the parallel_coordinates is useful in Pandas - at least I did not see any other "out of the box" alternatives 
 @undertherain ok this is fine. can you squash. ping when done.
 actually, pls add a whatnew note (enhancement section), use this PR number as the issue number
 I added the  whatsnew note with issue number
but for the "squashing" I can use some hint
 @undertherain See here for some explanation: http://pandas-docs.github.io/pandas-docs-travis/contributing.html#combining-commits
 @jorisvandenbossche yep, thank you! I've just got a bit confused as I made few changes, than merged with main version than make few more changes. Anyway, I hope I sorted it out and it should be ready now.
 @jreback oh, in case github doesn''t send notifications to people in the thread not being  mentioned explicitly  - ping.
 merged via https://github.com/pydata/pandas/commit/4b6fcc08f7831c2a59d75534f47a078120dac284

thanks!
