Python实战计划学习笔记（14）数据图表呈现作业

任务

分析sample数据中各大类发帖量，绘制图表

工具

python 3
charts库
jupyter网页编程环境

代码

import pymongo
import charts
client = pymongo.MongoClient('localhost',27017)
test = client['test']
item_info = test['sample']
for i in item_info.find().limit(200):
    print(i)  #观察发现数据规律
class_list = []
for i in item_info.find():
    class_list.append(i['cates'][2][4:])
class_index = list(set(class_list))   #生成不重复的大类名称列表
print(class_index)
post_times = []
for index in class_index:
    post_times.append(class_list.count(index))  #生成各大类发帖量
print(post_times)
def data_gen(types):   #数据生成器函数
    length = 0
    if length <= len(class_index):
        for class_name,times in zip(class_index,post_times):
            data = {
                'name':class_name,
                'data':[times],
                'type':types
            }
            yield(data)
            length+=1
for i in data_gen('column'):
    print(i)
series = [ data for data in data_gen('column')]
charts.plot(series, show='inline', options = dict(title=dict(text='58同城网站各类北京二手物品发帖量')))

运行结果

1.jpg