python里面的字典

今天药忘吃喽~ 2022-10-06 12:50 124阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70]字典用\{\}  
字典中是通过键来取值的，就不是通过索引来取值的。  
列表用【】,元组用(),字典用\{\}

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70 1]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70 2]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][20210614075438329.png]  
![在这里插入图片描述][20210614081258161.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70 4]![在这里插入图片描述][20210614081620236.png]  
和列表的修改是一样的，我们知道元组是不可修改的。其实元组这个我感觉真的是鸡肋。可能还没发现真正需要它的意思。

字典里的查既有键的查询也有值的查询

![在这里插入图片描述][20210614081909951.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70 5]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70 6]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70 7]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70 8]![在这里插入图片描述][20210614085103953.png]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70 9]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70 10]  
字典里的键也是唯一的。字典也是无序的。只是集合里面只能存储key,说实话我感觉key说不合适，我们就说和列表一样就好了，只是列表是有序的。

所以列表里面的值是可重复的

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWxhbmc2OA_size_16_color_FFFFFF_t_70 11]

# t1=(1,)
    # t2=()
    # str=('你好世界',)
    # print(t1)
    # print(t2)
    # print(type(t1))
    # print(type(str))
    
    
    # list=[1,2,3]
    # print(list[0:5])
    # t=(1,2,3)
    # print(t[0:5])
    # str='lai'
    # print(str)
    # print(str)
    # print(tuple(str))   #你加上tuple可以变成元组，但是str依旧是字符串变量
    # print(str)
    # list=[1,2,3,4]
    # dict={'1':'laji','2':'zhangsan','3':'lisi'}
    # print(list)
    # print(dict.keys())
    # print(type(list))
    # print(type(dict.keys()))
    # print(dict.values())
    # print(type(dict.values()))
    # print(dict.items())    # 列表里面包含了一个个的元组
    # print(type(dict.items()))
    # for item in dict.items():
    #     print(item)
    
    # list=[1,2,3,4,5]
    # list1=['haha']
    # list2=['hehe']
    # for i,x in enumerate(list):
    #     print(i,x)
    # print('*'*20)
    # for i in list:
    #     print(i,end='  ')
    #     print(list.index(i))
    #
    # list.insert(5,6)
    # list.append(7)
    # list.append(8)
    # list.extend(list1)
    # list.extend(list2)
    # print(list)
    # list3=[(1,2)]
    # print(dict(list))
    # print(dict(list3))
    #
    # dict={'1':'xiaming','2':'xiahua'}
    # print(dict)
    
    dict={'小学':'初中就好','初中':'高中就好','高中':'大学就好','大学':'我要毕业打工挣钱'}
    # 说增删改查
    dict['毕业']='干个2，3年就好了'
    print(dict)
    dict['nihao']='duanwujiekuaile'
    print(dict)
    
    # 改
    dict['大学']='我要考公务员'
    print(dict)
    
    # 查，我查查有没有老年
    # print(dict['老年'])   #这样写没有就会报错
    print(dict.get('老年','没有'))
    
    
    #删
    # del dict
    # print('你好世界')
    # print(dict)
    # dict['nihao']='duanwujiekuaile'
    # print(dict)
    # dict.clear()
    # print(dict)
    # dict['nihao']='duanwujiekuaile'
    # print(dict)
    
    
    
    
    
    # 先看下怎么遍历
    # 跟编列列表一样，遍历出来的展示也是和列表一样，但是它的类型不是列表的
    # for item in dict:
    #     print(item)
    # print('***************')
    # for key in dict.keys():
    #     print(key)
    # for value in dict.values():
    #     print(value)
    # for item in dict.items():
    #     print(item)
    #     print(type(item))

https://www.runoob.com/python/python-dictionary.html

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