017_set

#!/usr/bin/env python
# Author:liujun

list1 = [1,4,5,7,3,6,7,9]
list1 = set(list1)
    # set is unordered

list2 = set([2,6,0,66,22,8,4])
print(list1.intersection(list2))
print(list1 & list2)
    # Extract the intersection of the two lists

print(list1.union(list2))
print(list2 | list1)
    # Extract the union of the two lists

print(list1.difference(list2))
print(list1 - list2)
    # Extract the difference of the two lists

print(list1.issubset(list2))
    # Determine whether a list is a sutset of another

print(list1.issuperset(list2))
    # Determine whether a list is a parent of another

print(list1.symmetric_difference(list2))
print(list1 ^ list2)
    # Extract symmetric_difference of the two lists


list1.add(555)
    # Add single element

list1.update([55,66,88,99])
    # Add multiple elements


list1.pop()
    # Return and remove an arbitrary set element
list1.discard(888)
    # Remove the element

    
print(list1)