字典列表

#dict
'''
#数据类型划分：可变数据类型，不可变数据类型
不可变数据类型：元组，bool int str       可哈希
可变数据类型：list，dict set             不可哈希
dict key 必须是不可变数据类型，可哈希，
    value：任意数据类型。
dict 优点：二分查找去查询
         存储大量的关系型数据
      特点：无序的
'''
dic = {
    'name':['张三','李四'],
    'py9':[{'num':71,'avg_age':18,},
           {'num': 71, 'avg_age': 18, },
           {'num': 71, 'avg_age': 18, },
           ],
    True:1,
    (1,2,3):'wuyiyi',
    2:'二哥',
}
print(dic)
dic1 = {'age': 18, 'name': 'jin', 'sex': 'male',}
# 增：
dic1['high'] = 185  #没有键值对，添加
dic1['age'] = 16  #如果有键，则值覆盖

dic1.setdefault('weight')  # 有键值对，不做任何改变，没有才添加。
dic1.setdefault('weight',150)
dic1.setdefault('name','二哥')
print(dic1)

# 删
print(dic1.pop('age'))   # 有返回值，按键去删除
print(dic1.pop('二哥',None))   # 可设置返回值
print(dic1)

print(dic1.popitem())  # 随机删除 有返回值 元组里面是删除的键值。
# print(dic1)

# del dic1['name1']
# print(dic1)
# del dic1
# print(dic1)

# dic1.clear() #清空字典

# 改  update
dic1['age'] = 16

dic = {"name":"jin","age":18,"sex":"male"}
dic2 = {"name":"alex","weight":75}
print("********")
dic2.update(dic)  #把dic里面的值更新到dic2里面，有的覆盖，没有添加

print(dic)
print(dic2)
dic1 = {'age': 18, 'name': 'jin', 'sex': 'male',}
##查
print(dic1.keys(),type(dic1.keys()))
print(dic1.values())
print(dic1.items())
#字典的循环遍历
for i in dic1:
    print(i,dic1[i])
print("====")

for i in dic1.keys():
    print(i,dic1[i])


for i in dic1.values():
    print(i)    #18 jin male

for item in dic1.items():
    print(item) #('age', 18)  ('name', 'jin')  ('sex', 'male')

for k,v in dic1.items():
    print(k,v)  #age 18  name jin  sex male


# a,b = 1,2
# print(a,b)

# a = 1
# b = 2
# a,b = b,a
# print(a,b)
# a,b = [1,2],[2,3]
# a,b = (1,2)
# print(a,b)

# for k,v in dic1.items():
#     print(k,v)

# v1 = dic1['name']
# print(v1)

# v2 = dic1['name1']  # 报错
# print(v2)

# print(dic1.get('name1','没有这个键'))

# +
print('hello'+'world')  #helloworld
print([1.2]+[3,4])  #[1.2, 3, 4]
print((4,5)+(6,7))  #(4, 5, 6, 7

# *
print('ab'*4)   #abababab
print([1,2]*4)  #[1, 2, 1, 2, 1, 2, 1, 2]
print((2,3)*2)  #(2, 3, 2, 3)

# in
print(3 in [1,2])   #False
print(4 in (1,2,3,4))   #True
print('name' in {'name':'abc','age':18})    #True

list1 = ["张三","李四","小三","小五",[11,22,33,44]]

print(list1[1])   #李四
print(list1[0:3])   #['张三', '李四', '小三']


#增加 append，添加到最后
list1.append("aa")
print(list1)    #['张三', '李四', '小三', '小五', [11, 22, 33, 44], 'aa']

#插入 insert
list1.insert(2,'bb')
print(list1)    #['张三', '李四', 'bb', '小三', '小五', [11, 22, 33, 44], 'aa']
#增加，可迭代的，添加到最后
list1.extend('OKK')
print(list1)    #['张三', '李四', 'bb', '小三', '小五', [11, 22, 33, 44], 'aa', 'O', 'K', 'K']
list1.extend([0,9,8])
print(list1)    #['张三', '李四', 'bb', '小三', '小五', [11, 22, 33, 44], 'aa', 'O', 'K', 'K', 0, 9, 8]

#删除

list2 = ["aa","bb","cc","dd","88"]
list2.pop(1)   #按索引删除
print(list2)    #['aa', 'cc', 'dd', '88']
list2.pop() #默认删除最后一个
print(list2)    #['aa', 'bb', 'cc', 'dd']
list2.remove("cc")  #按元素删除
print(list2)    #['aa', 'dd']
# list2.clear()   #清空
print(list2)    #[]
# del list2   #删除列表
# del list2[0:2]  #切片删除
# print(list2)

#改
list2[0]="hhhh"
print(list2)    #['hhhh', 'dd']
list2[0:1] = "你好88"
print(list2)    #['你', '好', '8', '8', 'dd']

# 查
for i in list2:
    print(i)

print(list2[0:])   #['你', '好', '8', '8', 'dd']
print(list2[0:3])   #['你', '好', '8']

list3 = [11,22,33,44,55,22,44]
#len  长度
l =len(list3)
print(l)    #7
#count  次数
num = list3.count(22)
print(num)  #2
#index  获取索引值
print(list3.index(33))  #2
#sort  正向排序
list3.sort()
print(list3)    #[11, 22, 22, 33, 44, 44, 55]
#反向排序
list3.sort(reverse=True)
print(list3)    #[55, 44, 44, 33, 22, 22, 11]

#reverse 反转
list3.reverse()
print(list3)    #[11, 22, 22, 33, 44, 44, 55]

list4 = ["ABC","阿里巴巴","芝麻开门",["aa","bb","cc","dd"]]
print(list4[1][3])  #巴
list4[1]='支付宝'
print(list4)    #['ABC', '支付宝', '芝麻开门', ['aa', 'bb', 'cc', 'dd']]
print(list4[2].replace('开','关'))    #芝麻关门

#join 列表转化成字符串
list5 = ["ABC","阿里巴巴","芝麻开门"]
s='+++'.join(list5)
print(s)    #ABC+++阿里巴巴+++芝麻开门

#split 字符串转化成列表
s1 = 'ABCDEF'
print(s1.split())   #['ABCDEF']

# range

for i in range(10):
    print(i)
for i in range(3,10):
    print(i)

for i in range(0,10,3):
    print(i)
print("=========")
for i in range(10,0,-2):
    print(i)    #10,8,6,4,2

for i in range(0,10,-1):
    print(i)    #什么都不输出

for i in range(10,-1,-2):
    print(i)    #10,8,6,4,2,0