Python基础教程实践2,画幅好画（win7，64位系统）

一、下载reportlab

下载地址http://www.reportlab.com/ftp/
下载reportlab-2.5.win32-py2.7.exe

二、获取数据源

由于宿舍没有网络，只能能先下载好txt，然后放到虚拟机linux，里面的apache服务器里面，以此来实现。下载地址http://www.swpc.noaa.gov/ftpdir/weekly/Predict.txt

三、代码

Sunspots_roto.py

from urllib 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

URL='http://192.168.177.128/Predict.txt'
COMMENT_CHAR ='#:'

drawing = Drawing(400,200)
data = []
for line in urlopen(URL).readlines():
if not line.isspace() and not line[0] in COMMENT_CHAR:
data.append([float(n) for n in line.split()])

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 = [zip(times,pred),zip(times,high),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')

三、实现效果