python学习（5）类型转换和实例

类型转换：

字符串转为列表：

变量.split("  ")

(引号里是符号，把字符串通过什么符号拆分，转成列表（符号要是原来格式里有的)）

列表转为字符串：

" ".join（变量）

（引号里是符号，把列表通过什么符号转成字符串类型连接起来）

列表和元组互相转换：

强制转换

整型和字符串互相转换：

强制转换

列表转字典：

enumerate：获取索引和值

前加dict强制转换

字典转列表：

变量.items() 获取所有的对

前加list强制转换

实例：

例1：取出列表的最大值和最小值：

先排序，索引是0的最小，索引是-1的最大

例2：取出复杂结构数据放入新列表：

{"code":0,"message":"Success","zpData":[{"name":"全国","code":100010000,"url":"/?city=100010000"},{"name":"北京","code":101010100,"url":"/beijing/"},{"name":"上海","code":101020100,"url":"/shanghai/"},{"name":"广州","code":101280100,"url":"/guangzhou/"},{"name":"深圳","code":101280600,"url":"/shenzhen/"},{"name":"杭州","code":101210100,"url":"/hangzhou/"},{"name":"天津","code":101030100,"url":"/tianjin/"},{"name":"西安","code":101110100,"url":"/xian/"},{"name":"苏州","code":101190400,"url":"/suzhou/"},{"name":"武汉","code":101200100,"url":"/wuhan/"},{"name":"厦门","code":101230200,"url":"/xiamen/"},{"name":"长沙","code":101250100,"url":"/changsha/"},{"name":"成都","code":101270100,"url":"/chengdu/"},{"name":"郑州","code":101180100,"url":"/zhengzhou/"},{"name":"重庆","code":101040100,"url":"/chongqing/"},{"name":"佛山","code":101280800,"url":"/foshan/"},{"name":"合肥","code":101220100,"url":"/hefei/"},{"name":"济南","code":101120100,"url":"/jinan/"},{"name":"青岛","code":101120200,"url":"/qingdao/"},{"name":"南京","code":101190100,"url":"/nanjing/"},{"name":"东莞","code":101281600,"url":"/dongguan/"},{"name":"昆明","code":101290100,"url":"/kunming/"},{"name":"南昌","code":101240100,"url":"/nanchang/"},{"name":"石家庄","code":101090100,"url":"/shijiazhuang/"},{"name":"宁波","code":101210400,"url":"/ningbo/"},{"name":"福州","code":101230100,"url":"/fuzhou/"}]}

查看复杂数据结构的工具：

https://www.bejson.com/jsonviewernew/