[Python知识库]Python基础学习-08

Python基础学习-08

# Python gather
my_set = {"小呆呆", "小菲菲", "小羊羊"}
print(my_set)
# The set is unordered
for i in my_set:
    print(i)
print("超人强" in my_set)
# set add
my_set_1 = {"小呆呆", "小菲菲", "小羊羊", "迷糊老师"}
my_set.update(my_set_1)
print(my_set)
# 因为集合是不能重复的，所以相同的元素会被覆盖掉
my_set_2 = ['喜羊羊', '懒羊羊']
my_set.update(my_set_2)
print(my_set)
# Del
A = {"小呆呆", "小菲菲", "小羊羊", "迷糊老师"}
A.remove('小羊羊')
print(A)
# Remove: if the deleted item does not exist,an error will be reported
A = {"小呆呆", "小菲菲", "小羊羊", "迷糊老师"}
A.discard("小狼狼")
print(A)
A.pop()
# pop删除最后一项
print(A)
# 清空 clear()
A.clear()
print(A)
# del :Completely remove
del A
# traverse
my = {"小呆呆", "小菲菲", "小羊羊", "迷糊老师"}
for i in my:
    print(i)
# case 1
set1 = {"a", "b", "c"}
set2 = {1, 2, 3}
set3 = set1.union(set2)
print(set3)
# case 2
set1 = {"a", "b", "c"}
set2 = {1, 2, 3}
set1.update(set2)
print(set1)
# 取交集
my = {"1", "2", "3"}
you = {"1", "3", "4"}
my.intersection_update(you)
print(my)
# 返回一个新集合的取交集
my = {"1", "2", "3"}
you = {"1", "3", "4"}
z = my.intersection(you)
print(z)
# 取集合内不重复的元素
my = {"1", "2", "3"}
you = {"1", "3", "4"}
my.symmetric_difference_update(you)
print(my)
# 返回一个新集合的取集合内不重复的元素
my = {"1", "2", "3"}
you = {"1", "3", "4"}
z = my.symmetric_difference(you)
print(z)
# Test
# 1-检查fruits集中是否存在“apple”。
fruits = {"apple", "banana", "cherry"}
if "apple" in fruits:
    print("Yes, apple is a fruit!")
# 2-使用 add 方法将“orange”添加到fruits集中。
fruits = {"apple", "banana", "cherry"}
test = {"apple", "banana", "cherry", "orange"}
fruits.update(test)
print(fruits)
# 3-使用正确的方法将多个项目（more_fruits）添加到fruits 集中。
fruits = {"apple", "banana", "cherry"}
more_fruits = ["orange", "mango", "grapes"]
fruits.update(more_fruits)
print(fruits)
# 4-使用 remove 方法从fruits 集中删除“banana。
fruits = {"apple", "banana", "cherry"}
fruits.remove("banana")
print(fruits)
# 5-使用discard方法从fruits 集中删除“香蕉”。
fruits = {"apple", "banana", "cherry"}
fruits.discard("香蕉")
print(fruits)