基础语法_04 字典

Posted 2020-11-03 shuimusheng

# 字典：info={键：值，键：值。。。} 键：值，又称为“键值对”
添加：
xxx[新的key] = value

# 定义新的字典值

names = {}                              # 创建新的字典值        
names["name"] = "张三"            # 添加新的字典值：name
names["age"] = 18                    # 添加新的字段值：age

print(names)                              # 打印字典内容
            

删除：
del xxx[key]

# 定义新的字典
names = {}                              # 创建新的字典值        
names["name"] = "张三"            # 添加新的字典值：name
names["age"] = 18                    # 添加新的字段值：age

print(names)                             # 打印字典内容

del names[‘age‘]                        # 删除字典元素
print(names)    

修改：
xxx[已存在的key] = new_value

# 修改字典值
names = {}                              # 创建新的字典值        
names["name"] = "张三"            # 添加新的字典值：name
names["age"] = 18                    # 添加新的字段值：age

print(names)                             # 打印字典内容

names[‘age‘] = 19                        # 修改字典元素
print(names)    

查询：
xxx.get(key)

# 查询字典值
names = {}                              # 创建新的字典值        
names["name"] = "张三"            # 添加新的字典值：name
names["age"] = 18                    # 添加新的字段值：age

print(names)                             # 打印字典内容

names.get[‘name‘]                        # 查询字典中元素