1 # 在while循环中，else是当while条件不满足的时候执行的
 2 # 如果while循环是由break打断的，则不执行else
 3 index = 1
 4 while index < 11:
 5     index = index + 1
 6     if index == 5:
 7         # reak
 8         pass
 9     print(index)
10 else:
11     print("fuck you man")
12 print("son of bitch")
13 
14 for i in range(1,11):
15     print(i)
16     if i == 3:
17         break  # 也可以使用break和continue
18 else:       # for循环后面也可以有else
19     print("this is normal")
20 print("there is nothing here")

 1 lst = ["alex","allen","tony","tom"]
 2 s = "#".join(lst)
 3 print(s)
 4 
 5 s = "你今天学习python了么？"
 6 s = "_".join(s)
 7 print(s)
 8 
 9 s = "你今天准备什么时候睡觉"
10 s1 = "_".join(s)
11 print(s1)
12 lst = s1.split("_")
13 print(lst)

 1 lst = ["倚天屠龙记","诛仙","看见","追风筝的人"]
 2 # 正确
 3 for i in range(0,len(lst)):
 4     lst.pop()
 5 print(lst)
 6 # 把要删除的东西保存在一个新列表中
 7 new_lst = []
 8 for el in lst:
 9     new_lst.append(el)
10 # 循环新列表，删除老列表
11 for e in new_lst:
12     lst.remove(e)
13 print(lst)

 1 # fromkeys()
 2 # 把第一个参数中的每一项拿出来和第二个参数组成一个键值对
 3 # 生成出来的键指向的value是同一个对象，改变其中一个的时候，另一个也会跟着改变
 4 dic = dict.fromkeys(["jay","jj"],["周杰伦","林俊杰"])
 5 print(dic)
 6 dic["jay"].append("蔡依林")
 7 print(dic)
 8 dic = {}
 9 dic.fromkeys(["葫芦娃","蛇精"],["冯提莫","陈一发"])
10 print(dic) # 什么都不打印，因为fromkeys是个静态方法
11 # 字典在循环迭代的过程中不能删除，会发生错误
12 dic = {"alex":15,"allen":23,"kitty":18}
13 for item in dic:  # 直接循环迭代的时候拿到的是key
14     if item == "alex":
15         dic.pop(item)    # RuntimeError: dictionary changed size during iteration
16 
17 dic = {"alex":15,"allen":23,"kitty":18}
18 lst = ["alex","allen"]
19 for el in lst:  # 循环list
20     dic.pop(el)  # 删除的是dict中的元素
21 print(dic)

lst = ["发图哥","谁困","就轰炸谁"]
print(type(lst))
tu1 = tuple(lst)
print(type(tu1))
lst1 = list(tu1)
print(type(lst1))

# 能转换成False的数据类型有哪些？
# 0, "", [], {}, (), None, set(), False

 1 # dic = {"朱元璋":"明太祖", "朱棣":"明成祖", "朱元璋":"朱重八"}
 2 # dic[‘朱元璋‘] = "和尚"
 3 # print(dic)
 4 # # set就是存储的key, set集合不会重复, 无序
 5 # s = {"朱元璋", "朱元璋", "朱棣"}
 6 # print(s)
 7 
 8 # s = {"alex", 1, True, {"你好"}}
 9 # s = {"马虎疼", [1,4,7]} # 不合法. [] 列表是不可哈希的
10 # s = {"呵呵", "哈哈", "吼吼", (1, 4, 7)}
11 # print(s)
12 
13 # 去重复
14 # lst = [1,4,7,1,4,5,6,7,8,2,1,3,9]
15 # s = set(lst)
16 # lst = list(s)
17 # print(lst)
18 
19 # s = set({})
20 # s.add("王祖蓝") # 添加元素
21 # s.add("王祖贤")
22 # s.add("王祖蓝")
23 # print(s)
24 
25 s = {"李谷一", "周润发", "邓丽君", "黄家驹", "张国荣"}
26 # s.update("中岛美嘉") # 迭代更新
27 # print(s)
28 
29 # s.update(["中岛美雪", "很牛B"])
30 # print(s)
31 # s = {"李谷一", "周润发", "邓丽君", "黄家驹", "张国荣"}
32 # item = s.pop() # 随机删除
33 # print(item)
34 # s.clear()
35 # print(s)
36 # for el in s:
37 #     print(el)
38 
39 # s1 = {"刘能", "赵四", "皮长山"}
40 # s2 = {"刘科长", "冯乡长", "皮长山"}
41 
42 # 求交集
43 # print(s1 & s2)
44 # print(s1.intersection(s2)) # 交集
45 
46 # 并集
47 # print(s1 | s2)
48 # print(s1.union(s2)) # 并集
49 
50 # s1 = {"刘能", "赵四", "皮长山"}
51 # s2 = {"刘科长", "冯乡长", "皮长山"}
52 # 差集, 把自己本身中和对方不相关的内容留下
53 # print(s2 - s1)
54 # print(s2.difference(s1))
55 
56 # s = frozenset({1,5,7})
57 # # print(s)
58 # # # for el in s:
59 # # #     print(el)
60 # dic = {s: "周杰伦"} # 验证. frozen是可哈希的. 不可变
61 # print(dic)

 1 # 深浅拷贝
 2 lst1 = ["紫衫龙王","白眉鹰王","青翼蝠王","金毛狮王"]
 3 lst2 = lst1
 4 print(id(lst1),id(lst2)) # 内存地址一样是同一个对象
 5 
 6 lst1 = ["紫衫龙王","白眉鹰王","青翼蝠王","金毛狮王"]
 7 lst2 = lst1.copy()  # 拷贝 克隆 复制
 8 lst2.append("张无忌")
 9 print(id(lst1),id(lst2))
10 print(lst1,lst2)
11 
12 lst1 = ["紫衫龙王","白眉鹰王","青翼蝠王","金毛狮王"]
13 lst2 = lst1[:]
14 print(id(lst1),id(lst2))
15 
16 lst1 = ["杨晓", "谢逊", ["说不得","听不得","打不得","骂不得"]]
17 lst2 = lst1.copy()  # 拿到的是第一层的复制品
18 print(id(lst1[2]),id(lst2[2]))
19 lst1[2].append("看不得")
20 print(lst1,lst2)
21 import copy
22 lst1 = ["杨晓", "谢逊", ["说不得","听不得","打不得","骂不得"]]
23 lst2 = copy.deepcopy(lst1)    # 深度copy
24 print(id(lst1[2]), id(lst2[2]))
25 lst1[2].append("看不得")
26 print(lst1, lst2)