Python3学习笔记

>>> thisset =set(("Google","Runoob","Taobao","Facebook"))

>>> y=set({'python'})

>>>print(y.union(thisset))

{'python','Taobao','Google','Facebook','Runoob'}

输出结果:

{'python','Google','Taobao','Facebook','Runoob'}

y 的集合里此时只含有一个元素 'python'，而如果不加花括号时，y 的集合里含有'p','y','t','h','o','n'五个元素。

>>> thisset =set(("Google","Runoob","Taobao","Facebook"))

>>> y=set('python')

>>>print(y.union(thisset))

{'p','o','y','Taobao','h','Google','Facebook','Runoob','n','t'}

也可以使用括号：

thisset =set(("Google","Runoob","Taobao","Facebook"))

y=set(('python','love'))

print(y.union(thisset))

输出结果:

{'Facebook','Runoob','Taobao','python','love','Google'}

但是当 y 的集合里只有一个字符串时，结果与不加花括号一样。