<python从入门到实践>中16章绘制周日均值问题，救救我

import json
import pygal
import math
from itertools import groupby

filename = 'btc_close_2017.json'
with open(filename) as f:
    btc_data = json.load(f)

dates = []
months = []
weeks = []
weekdays = []
close = []
for btc_dict in btc_data:
    dates.append(btc_dict['date'])
    months.append((btc_dict['month']))  
    weeks.append(btc_dict['week'])
    weekdays.append(btc_dict['weekday'])
    close.append(int(float(btc_dict['close'])))

def draw_line(x_data,y_data,title,y_legend):
    xy_map = []
    for x,y in groupby(sorted(zip(x_data,y_data)),key = lambda _: _[0]):
        y_list = [v for _,v in y]
        xy_map.append([x,sum(y_list)/len(y_list)])
    x_unique,y_mean = [*zip(*xy_map)]
    line_chart = pygal.Line()
    line_chart.title = title
    line_chart.x_labels = x_unique
    line_chart.add(y_legend,y_mean)
    line_chart.render_to_file(title + '.svg')
    return line_chart   

idx_week = dates.index('2017-12-11')
line_chart_week = draw_line(weeks[1:idx_week],close[1:idx_week],'收盘价周日均值','周日均只')
line_chart_week

https://blog.csdn.net/WSheng_Pyhon/article/details/80438442