Learn_Day5

1 l1 = [11, 22, 11, 2]
2 s2_l1 = set(l1)
3 print("s2_l1", s2_l1)  # s2 {2, 11, 22}
4 t1 = (11, 22, 11, 2)
5 s2_t1 = set(t1)
6 print("s2_t1", s2_t1)  # s2_t1 {2, 11, 22}

se = {11, 22, 33}
se.add(44)
print("add==>>", se)
# add==>> {33, 11, 44, 22}

se = {11, 22, 33}
se.clear()
print("clear==>>", se)
# clear==>> set()

se = {11, 22, 33, 44}
be = {22, 55}
# se有，be没有
ret = se.difference(be)
print("se==>>", se, "difference==>>", ret)
# se==>> {33, 11, 44, 22} difference==>> {33, 11, 44}
# se有，be没有，更新se（删除相同的）
ret = se.difference_update(be)
print("se==>>", se, "difference_update==>>", ret)
# se==>> {33, 11, 44} difference_update==>> None

se = {11, 44, 77, 55} 
be = {33, 77, 22, 55}

# 删除指定元素，不存在不报错
se.discard(55)
print("discard==>>", se)
# discard==>> {33, 11, 44, 77, 22}
# 删除指定元素，不存在报错
se.remove(55)
print("remove", se)
# KeyError: 55(报错）

 1 se = {11, 22, 33, 44}
 2 be = {22, 55}
 3 # 找交集
 4 ret = se.intersection(be)
 5 print("se==>>", se, "intersection==>>", ret)
 6 # se==>> {33, 11, 44, 22} intersection==>> {22}
 7 # 找到交集并更新到se
 8 ret = se.intersection_update(be)
 9 print("se==>>", se, "intersection_update==>>", ret)
10 # se==>> {33, 11, 44, 22} intersection_update==>> None

se = {11, 22, 33, 44}
be = {22, 55}

# 判断有无交集，有交集返回False，无交集返回True
ret = se.isdisjoint(be)
print("isdisjoint==>>", ret)
# isdisjoint==>> False

 1 se = {11, 22, 33, 44}
 2 be = {22, 55}
 3 
 4 # 判断se是否为be的子序列，是返回True，不是返回False
 5 ret = se.issubset(be)
 6 print("issubset==>>", ret)
 7 # issubset==>> False
 8 # 判断se是否为be的父序列，是返回True，不是返回False
 9 ret = se.issuperset(be)
10 print("issuperst==>>", ret)
11 # issuperst==>> False

se = {11, 22, 33, 44}
# 移除元素并重新赋值(随机)
ret = se.pop()
print("se==>>", se, "pop==>>", ret)
# se==>> {11, 44, 22} pop==>> 33

se = {11, 22, 33, 44}
be = {22, 55, 77, 33}
# 找se中有be中没有,找be中有se中没有，并赋值给新的变量
ret = se.symmetric_difference(be)
print("se==>>", se, "symmetric_difference==>>", ret)
# se==>> {33, 11, 44, 22} symmetric_difference==>> {11, 44, 77, 55}
# 找se中有be中没有,找be中有se中没有，并赋更新到se
ret = se.symmetric_difference_update(be)
print("se==>>", se, "symmetric_difference_update==>>", ret)
# se==>> {11, 44, 77, 55} symmetric_difference_update==>> None

 1 # 1
 2 s1 = int(input("输入数字："))
 3 if s1 == 1:
 4     name = "alex"
 5 else:
 6     name = "aric"
 7 print("1:", name)
 8 # 1: alex
 9 
10 # 2
11 name = "alex" if s1 == 1 else "aric"
12 print("2:", name)
13 # 2: alex
14 
15 # 将1简写成2，为三目运算（三元运算）

import copy

# 数字、字符串
n1 = 123
# n1 = "i am alex age 10"
print(id(n1))
# 赋值：id不变
n2 = n1
print(id(n2))
# 浅拷贝：id不变
n2 = copy.copy(n1)
print(id(n2))
# 深拷贝：id不变
n3 = copy.deepcopy(n1)
print(id(n3)

 1 import copy
 2 
 3 # 其他数据类型
 4 n1 = {"k1": "wu", "k2": 123, "k3": ["alex", 456]}
 5 # 赋值：id不变
 6 n2 = n1
 7 # 浅拷贝：最外层id改变，里层id不变
 8 n1 = {"k1": "wu", "k2": 123, "k3": ["alex", 456]}
 9 n3 = copy.copy(n1)
10 # 深拷贝：外层id改变，最里层id不变
11 n1 = {"k1": "wu", "k2": 123, "k3": ["alex", 456]}
12 n4 = copy.deepcopy(n1)

# def 函数名（参数）：  函数名不能是中文
#     函数体
#     return 值  只要执行return，return下面的代码将不再执行