E.Nurminski wrote: > Hello to all good people > > I am new to the great Py so am quite puzzled by the following code > > --------------- > > res = [] > x = [ 1, 1 ] > for i in xrange(0,5): > res.append(x) > x[1] = x[1] + 1 > print "x = ", x > print "res = ", res > > --------------- > > Looks like it puts smth like reference to 'x' into 'res' list, instead of > value. But if I want a value should I use a different method or what ? > > Evgeni > > P.S. Could not easily find the issue in the manual/tutorial can you point > me out to smth relevant ? >
Yes the same reference gets added every time. res = [] x = [1, 1] for i in xrange(0,5): newx = x[:] # copy the x res.append(newx) # append the copy newx[1] += 1 # shorthand print "newx = %s" % newx # basic formatting print "res = %s" % res # should be what you expect James -- James Stroud UCLA-DOE Institute for Genomics and Proteomics Box 951570 Los Angeles, CA 90095 http://www.jamesstroud.com/ -- http://mail.python.org/mailman/listinfo/python-list
