[Chimera-users] savepos

[Tom Goddard]

Hi Matt,

  A Python dictionary is not ordered.  So positions.keys() can return the values in any order and it can and does change order as more positions are added (because it is a hash map which reallocates as the size grows).  So if you want them ordered then you order them yourself, for instance alphabetically:

	pnames = list(positions.keys())
	pnames.sort()

  Tom


> On Jun 3, 2015, at 6:07 AM, Dougherty, Matthew T wrote:
> 
> Hi, 
> 
> I have been automating the creation of positions using python scripts.  Something relatively simple like p001, p002, etc.
> 
> When I examine the positions using the python commands
> from Midas import positions
> pnames = positions.keys()
> 
> at first things appear as I would expect, but later the sequence changes relative to the index, why is that?
> 
> for example, using this to print the positions
> 
>         pnames = positions.keys()
>         i=0
>         for pname in pnames:
>           print i,pnames[i]
>           i=i+1
> 
> 
> 
> 
> I get these results:
> 
> savepos p000
> savepos p001
> 0 p000
> 1 p001
> (as expected)
> 
> savepos p002
> 0 p000
> 1 p001
> 2 p002
> (as expected)
> 
> savepos p003
> 0 p000
> 1 p001
> 2 p002
> 3 p003
> (as expected)
> 
> savepos p004
> 0 p004
> 1 p000
> 2 p001
> 3 p002
> 4 p003
> (not as expected)
> 
> savepos p005
> 0 p004
> 1 p005
> 2 p000
> 3 p001
> 4 p002
> 5 p003
> (not as expected)
> 
> 
> I would expect pnames[0] to correspond to the first position created, pnames[1] to the second posiiton created, etc., assuming no ~savepos used. 
> 
> Want to create a situation where the default names would be pxxx, but could later be altered to more meaningful names but maintain the order of creation, or getting a session file from someone I would use their position names and tack on my default names to the end of the position list.
> 
> 
> 
> Matthew Dougherty
> National Center for Macromolecular Imaging
> Baylor College of Medicine
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