| 方法名 | 语法格式 | 功能 | 实例 |
|---|
| add() | set1.add() | 向 set1 集合中添加数字、字符串、元组或者布尔类型 | >>> set1 = {1,2,3}
>>> set1.add((1,2))
>>> set1
{(1, 2), 1, 2, 3} |
| clear() | set1.clear() | 清空 set1 集合中所有元素 | >>> set1 = {1,2,3}
>>> set1.clear()
>>> set1
set()
set()才表示空集合，{}表示的是空字典 |
| copy() | set2 = set1.copy() | 拷贝 set1 集合给 set2 | >>> set1 = {1,2,3}
>>> set2 = set1.copy()
>>> set1.add(4)
>>> set1
{1, 2, 3, 4}
>>> set1
{1, 2, 3} |
| difference() | set3 = set1.difference(set2) | 将 set1 中有而 set2 没有的元素给 set3 | >>> set1 = {1,2,3}
>>> set2 = {3,4}
>>> set3 = set1.difference(set2)
>>> set3
{1, 2} |
| difference_update() | set1.difference_update(set2) | 从 set1 中删除与 set2 相同的元素 | >>> set1 = {1,2,3}
>>> set2 = {3,4}
>>> set1.difference_update(set2)
>>> set1
{1, 2} |
| discard() | set1.discard(elem) | 删除 set1 中的 elem 元素 | >>> set1 = {1,2,3}
>>> set1.discard(2)
>>> set1
{1, 3}
>>> set1.discard(4)
{1, 3} |
| intersection() | set3 = set1.intersection(set2) | 取 set1 和 set2 的交集给 set3 | >>> set1 = {1,2,3}
>>> set2 = {3,4}
>>> set3 = set1.intersection(set2)
>>> set3
{3} |
| intersection_update() | set1.intersection_update(set2) | 取 set1和 set2 的交集，并更新给 set1 | >>> set1 = {1,2,3}
>>> set2 = {3,4}
>>> set1.intersection_update(set2)
>>> set1
{3} |
| isdisjoint() | set1.isdisjoint(set2) | 判断 set1 和 set2 是否没有交集，有交集返回 False；没有交集返回 True | >>> set1 = {1,2,3}
>>> set2 = {3,4}
>>> set1.isdisjoint(set2)
False |
| issubset() | set1.issubset(set2) | 判断 set1 是否是 set2 的子集 | >>> set1 = {1,2,3}
>>> set2 = {1,2}
>>> set1.issubset(set2)
False |
| issuperset() | set1.issuperset(set2) | 判断 set2 是否是 set1 的子集 | >>> set1 = {1,2,3}
>>> set2 = {1,2}
>>> set1.issuperset(set2)
True |
| pop() | a = set1.pop() | 取 set1 中一个元素，并赋值给 a | >>> set1 = {1,2,3}
>>> a = set1.pop()
>>> set1
{2,3}
>>> a
1 |
| remove() | set1.remove(elem) | 移除 set1 中的 elem 元素 | >>> set1 = {1,2,3}
>>> set1.remove(2)
>>> set1
{1, 3}
>>> set1.remove(4)
Traceback (most recent call last):
File "<pyshell#90>", line 1, in <module>
set1.remove(4)
KeyError: 4 |
| symmetric_difference() | set3 = set1.symmetric_difference(set2) | 取 set1 和 set2 中互不相同的元素，给 set3 | >>> set1 = {1,2,3}
>>> set2 = {3,4}
>>> set3 = set1.symmetric_difference(set2)
>>> set3
{1, 2, 4} |
| symmetric_difference_update() | set1.symmetric_difference_update(set2) | 取 set1 和 set2 中互不相同的元素，并更新给 set1 | >>> set1 = {1,2,3}
>>> set2 = {3,4}
>>> set1.symmetric_difference_update(set2)
>>> set1
{1, 2, 4} |
| union() | set3 = set1.union(set2) | 取 set1 和 set2 的并集，赋给 set3 | >>> set1 = {1,2,3}
>>> set2 = {3,4}
>>> set3=set1.union(set2)
>>> set3
{1, 2, 3, 4} |
| update() | set1.update(elem) | 添加列表或集合中的元素到 set1 | >>> set1 = {1,2,3}
>>> set1.update([3,4])
>>> set1
{1,2,3,4} |
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