Suppose you have to remove unique elements from a list. This is what you can do:
digits = [ 1, 2, 1, 4, 5, 3, 4, 2, 3, 7, 8 ]
copy = []
for x in digits:
if digits.count(x) == 1:
copy.append(x)
for y in copy:
digits.remove(y)
print digits
copy = []
for x in digits:
if digits.count(x) == 1:
copy.append(x)
for y in copy:
digits.remove(y)
print digits
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Explanation:
1. Why two loops?
Never remove elements from a list while iterating the same list. This will give unexpected results. Better make a new list, add all the elements to be removed in the new list. Then remove the elements in this new from original list. That's exactly what I have done.
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