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python项目练习二:画幅好画

作者:the5fire | 标签:     | 发布:2011-12-18 11:35 p.m. | 阅读量: 56058, 55405
这是《python基础教程》中的第二个项目,关于python操作PDF

涉及到的知识点



  • 1、urllib的使用

  • 2、reportlab库的使用


这个例子着实很简单,不过我发现在python里面可以直接在数组[]里面写for循环,真是越用越方便。

下面是代码:

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://www.swpc.noaa.gov/ftpdir/weekly/Predict.txt'
COMMENT_CHARS = '#:'

drawing = Drawing(400, 200)
data = []
for line in urlopen(URL).readlines():
if not line.isspace() and not line[0] in COMMENT_CHARS:
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, 'report3.pdf','Sunspots')



2017-05-15更新

Django教程


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