关于pygal

import json
import pygal

# 将数据加载到一个列表中
filename = 'btc_close_2017.json'
with open(filename) as f:
	btc_date = json.load(f)
# 创建5个列表，分别存储日期和收盘价
dates, months, weeks, weekdays, close = [], [], [], [], []
# 每一天的信息
for btc_dict in btc_date:
	dates.append(btc_dict['date'])
	months.append(int(btc_dict['month']))
	weeks.append(int(btc_dict['week']))
	weekdays.append(btc_dict['weekday'])
	close.append(int(float(btc_dict['close'])))

line_chart = pygal.Line(x_label_rotation=20, show_minor_x_labels=False)
line_chart.title = '收盘价 (RMB) '
line_chart.x_labels = dates
N = 20 # x轴坐标每隔20天显示一次
line_chart.x_labels_major = dates[::N]
line_chart.add('收盘价', close)
line_chart.render_to_file('收盘价折线图(RMB).svg')

pygal 可以画折线图的

line_chart = pygal.Line(x_label_rotation=20, show_minor_x_labels=False)
# x_label_rotation=20 让x轴顺时针旋转20°   show_minor_x_labels=False 告诉图形不用显示x轴的标签

设置坐标轴

N = 20 # x轴坐标每隔20天显示一次
line_chart.x_labels_major = dates[::N]