代码如下：
idx_week = dates.index('2017-12-11')
wd = ['Monday', 'Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday']
weekdays_int = [wd.index(w) + 1 for w in weekdays[1:idx_week]]
line_chart_weekday = draw_line_weekday(weekdays_int, closes[1:idx_week], '收盘价周均值(￥)', '周均值')
这个问题有人发布过了，但是并没有看懂？
weekdays_int = [wd.index(w) + 1 for w in weekdays[1:idx_week]]
# 就是以下代码
# 遍历 weekdays , 从 1 到 idx_week
weekdays_int = []
for w in weekdays[1:idx_week]:
weekdays_int.append(wd.index(w) + 1)