python 集合关系运算交，差 day14，,去重并创建集合（无序

python 集合关系运算交，差 day14，,去重并创建集合（无序

去重并创建集合（无序）

python_1 = [‘1‘,‘2‘,‘3‘]linux_1 = [‘1‘,‘2‘]#python_and_linux_1 = []#for p_name in python_1:#    if p_name in linux_1:#        python_and_linux_1.append(p_name)#print(python_and_linux_1)p_s = set(python_1)print(p_s)

求交集

python_1 = [‘1‘,‘2‘,‘3‘]linux_1 = [‘1‘,‘2‘]#python_and_linux_1 = []#for p_name in python_1:#    if p_name in linux_1:#        python_and_linux_1.append(p_name)#print(python_and_linux_1)p_s = set(python_1)l_s = set(linux_1)print(p_s,l_s)print(p_s.intersection(l_s))print(p_s&l_s)#同上述函数

求并集

python_1 = [‘1‘,‘2‘,‘3‘]linux_1 = [‘1‘,‘2‘,‘4‘]#python_and_linux_1 = []#for p_name in python_1:#    if p_name in linux_1:#        python_and_linux_1.append(p_name)#print(python_and_linux_1)p_s = set(python_1)l_s = set(linux_1)print(p_s,l_s)print(p_s.union(l_s))print(p_s|l_s)

求差集

python_1 = [‘1‘,‘2‘,‘3‘]linux_1 = [‘1‘,‘2‘,‘4‘]#python_and_linux_1 = []#for p_name in python_1:#    if p_name in linux_1:#        python_and_linux_1.append(p_name)#print(python_and_linux_1)p_s = set(python_1)l_s = set(linux_1)print(p_s,l_s)

print(p_s.difference(l_s))

print(p_s-l_s)

集合其他方法

交叉补集 并集-交集

python_1 = [‘1‘,‘2‘,‘3‘]linux_1 = [‘1‘,‘2‘,‘4‘]#python_and_linux_1 = []#for p_name in python_1:#    if p_name in linux_1:#        python_and_linux_1.append(p_name)#print(python_and_linux_1)p_s = set(python_1)l_s = set(linux_1)print(p_s,l_s)print(p_s.symmetric_difference(l_s))print(p_s^l_s)

difference_update

p_s=p_s-l_s

==p_s.difference_update(l_s)

同理 intersection_update

isdisjoint 两个合集无共同元素

返回布尔值

issubset，s1包含于s2，子集

相当于s1<s2

返回布尔值

python_1 = [‘1‘,‘2‘,‘3‘]linux_1 = [‘1‘,‘2‘,‘4‘]p_s = set(python_1)l_s = set(linux_1)print(p_s,l_s)print(p_s.issubset(l_s))

issuperset，父集

update更新元素，add只能添加一个元素

s1={1,2}s2={1,2,3,4}s1.update(s2)print(s1)

python 集合关系运算交，差 day14