Python基礎＆実践プログラミング Ch21.5 swpcのデータがtxtではなくjson形式に変わっていたため、修正コード

sunsplots.py

from urllib.request import urlopen
from reportlab.graphics.shapes import *
from reportlab.graphics.charts.lineplots import LinePlot
from reportlab.graphics.charts.textlabels import Label
from reportlab.graphics import renderPDF
import json

URL = "https://services.swpc.noaa.gov/json/solar-cycle/predicted-solar-cycle.json"

drawing = Drawing(400, 200)

data = []
sunSpotData = json.load(urlopen(URL))
for row in sunSpotData:
    year = row['time-tag'][0:4]
    month = row['time-tag'][-2:]
    item = (int(year), int(month), float(row['predicted_ssn']), float(row['high_ssn']), float(row['low_ssn']),
            float(row['predicted_f10.7']), float(row['high_f10.7']), float(row['low_f10.7']))
    data.append(item)

pred = [row[2] for row in data]
high = [row[3] for row in data]
low = [row[4] for row in data]
times = [row[0] + row[1]/12.0 for row in data]

lp = LinePlot()
lp.x = 50
lp.y = 50
lp.height = 125
lp.width = 300
lp.data = [list(zip(times, pred)),
           list(zip(times, high)),
           list(zip(times, low))]

lp.lines[0].strokeColor = colors.blue
lp.lines[1].strokeColor = colors.red
lp.lines[2].strokeColor = colors.green

drawing.add(lp)
drawing.add(String(250, 150, 'Sunspots', fontSize=14, fillColor=colors.red))
renderPDF.drawToFile(drawing, 'report2.pdf', 'Sunspots')