The above example may print repeated items. Below will generate a random list…
>>> from random import randrange
>>> randlist = []
>>> while len(randlist) < len(elements):
x = randrange(0, len(elements))
if elements[x] not in randlist:
randlist.append(elements[x])
>>> randlist
['Helium', 'Nitrogen', 'Hydrogen', 'Carbon', 'Oxygen']
>>>