This time I will show you how to use python to operate PDF, and what are the precautions for using python to operate PDF. The following is a practical case, let's take a look.
Knowledge points involved1. Use of urllib2. Use of reportlab libraryThis example is really simple, but I found that in In python, you can writefor loop directly in the array [], which becomes more convenient the more you use it.
The following is the code: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')
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