# set_variances.py

# set_variances.py

a = set([1,2,3,4])
b = set([3,4,5,6])
print a | b # Union
# {1, 2, 3, 4, 5, 6}
print a & b # Intersection
# {3, 4}
print a - b # Difference
# {1, 2}
print a ^ b # Symmetric Difference
# {1, 2, 5, 6}