Python笔记——集合和列表

创建列表

>>> place = ['Beijing','Shanghai','Hangzhou','henan','guangdong','Beijing','Hangzhou']

列表去重

unique_place = set(place)

去重打印结果

>>> print(unique_place)
{'Shanghai', 'guangdong', 'henan', 'Hangzhou', 'Beijing'}

列表添加元素

place.append('London')

添加打印结果

>>> place.append('London')
>>> place
['Beijing', 'Shanghai', 'Hangzhou', 'henan', 'guangdong', 'Beijing', 'Hangzhou', 'London']

创建集合

>>> numbers = {1,2,3,4,5,6,7,8}
>>> numbers
{1, 2, 3, 4, 5, 6, 7, 8}

集合添加元素

>>> numbers.add(9)
>>> numbers
{1, 2, 3, 4, 5, 6, 7, 8, 9}

从集合中去除一个元素

>>> numbers.pop()
1
>>> numbers
{2, 3, 4, 5, 6, 7, 8, 9}
>>>