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Just use the usual pythonic way to format numbers. For instance:

myList = (pi, exp(16), sqrt(2019))
for x in myList:
    print "%.2f" % x

The above gives:

3.14
8886110.52
44.93

(Using format there are some problems, but the above works and it is enough for our purposes.) So in our case, in a dialog with the sage interpreter:

sage: myList = sorted([ 2*cos(2*pi*j/5) for j in range(5) ])
sage: myList
[-1/2*sqrt(5) - 1/2,
 -1/2*sqrt(5) - 1/2,
 1/2*sqrt(5) - 1/2,
 1/2*sqrt(5) - 1/2,
 2]
sage: print [ '%.2f' % x for x in myList ]
['-1.62', '-1.62', '0.62', '0.62', '2.00']
sage: print ', '.join( [ '%.2f' % x for x in myList ] )
-1.62, -1.62, 0.62, 0.62, 2.00