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 ===========================================================================
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 =========================================================================== _______________________________________________ Chimera-users mailing list Chimera-users@cgl.ucsf.edu <mailto:Chimera-users@cgl.ucsf.edu> http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users <http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users>
participants (2)
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Dougherty, Matthew T -
Tom Goddard