leodp wrote: > >> Or provide a better explanation and an example. Do you mean something >> like this? >> > > Hi Peter, > a small example: > > master=[1,4,3,2] > slave1=['d','c','b','a'] > slave2=[1,2,3,4] > > master.sort() # this is ok, but does not return infos on how the list > was sorted > slave1.sort(key=_maybe_something_here_referring_to_master_) > slave2.sort(key=_maybe_something_here_referring_to_master_) > > Then I should get: > master=[1,2,3,4] > slave1=['d','a','b','c'] > slave2=[1,4,3,2] > > > Hope it is more clear now. > Thanks, leodp
You need a helper list (called master_index in the example below): >>> master=[1,4,3,2] >>> slave1=['d','c','b','a'] >>> slave2=[1,2,3,4] >>> master_index = range(len(master)) >>> master_index.sort(key=master.__getitem__) >>> master[:] = [master[i] for i in master_index] >>> slave1[:] = [slave1[i] for i in master_index] >>> slave2[:] = [slave2[i] for i in master_index] >>> master [1, 2, 3, 4] >>> slave1 ['d', 'a', 'b', 'c'] >>> slave2 [1, 4, 3, 2] If you don't care about list object identity you can use master = [...] instead of master[:] = [...] etc. Peter -- http://mail.python.org/mailman/listinfo/python-list
