python学习-21 集合 2

math = {'xm','xh','xg','xx'}
english ={'xm','xh','dm','john'}

print(math.symmetric_difference(english))

{'dm', 'john', 'xx', 'xg'}

Process finished with exit code 0

math = {'xm','xh','xg','xx'}
english ={'xd','xb','dm','john'}

print(math.isdisjoint(english))

True

Process finished with exit code 0

math = {'xm','xh','xg','xx'}
english ={'xd','xb','dm','john'}

print(math.issubset(english))

False       （因为不是，所以返回false）

Process finished with exit code 0

math = {'xm','xh','xg','xx'}
english ={'xd','xb','dm','john'}
math.update(english)
print(math)

{'xm', 'xh', 'john', 'xb', 'xd', 'dm', 'xx', 'xg'}

Process finished with exit code 0

s = frozenset('hello')
print(s)

frozenset({'e', 'l', 'h', 'o'})

Process finished with exit code 0