Beginning Python - From Novice to Professional

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CHAPTER 21 ■ PROJECT 2: PAINTING A PRETTY PICTURE 419 for line in urlopen(URL).readlines(): if not line.isspace() and not line[0] in COMMENT_CHARS: data.append(map(float, 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') Figure 21-4. The final sunspot graph
420 CHAPTER 21 ■ PROJECT 2: PAINTING A PRETTY PICTURE Further Exploration As I mentioned before, many graphics and plotting packages are available for Python. One good alternative to ReportLab is P Y X, which I have mentioned earlier in this chapter. It is also possible to use wxPython (discussed in Chapter 12) to create vector graphics files of different kinds. Using either ReportLab or P Y X (or some other package) you could try to incorporate automatically generated graphics into a document (perhaps generating parts of that as well). You could use some of the techniques from Chapter 20 to add markup to the text. If you want to create a PDF document, Platypus, a part of ReportLab, is useful for that. (You could also integrate the PDF graphics with some typesetting system such as pdf ALTEX .) If you want to create Web pages, there are ways of creating pixmap graphics (such as GIF or PNG) using Python as well—just do a Web search on the topic. If your primary goal is to plot data (which is what we did in this project), there are many alternatives to ReportLab and P Y X. One good option is Matplotlib/pylab (http://matplotlib. sf.net), but there are many, many other (similar) packages. What Now? In the first project, you learned how to add markup to a plain-text file by creating an extensible parser. In the next project, you learn about analyzing marked-up text (in XML) by using parser mechanisms that already exist in the Python standard library. The goal of the project is to use a single XML file to specify an entire Web site, which will then be generated automatically (with files, directories, added headers, and footers) by your program. The techniques you learn in the next project will be applicable to XML parsing in general, and with XML being used in an increasing number of different settings, that can’t hurt.
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Beginning Python From Novice to Pro
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For Ranveig
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■CHAPTER 23 Project 4: In the New
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viii ■CONTENTS Strings . . . . .
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x ■CONTENTS ■CHAPTER 5 Conditio
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xxii ■CONTENTS Preparations . . .
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About the Technical Reviewer ■JER
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Introduction A C program is like a
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CHAPTER 1 ■ ■ ■ Instant Hacki
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CHAPTER 9 ■ MAGIC METHODS, PROPER
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256 CHAPTER 11 ■ FILES AND STUFF
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270 CHAPTER 12 ■ GRAPHICAL USER I
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298 CHAPTER 14 ■ NETWORK PROGRAMM
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314 CHAPTER 15 ■ PYTHON AND THE W
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358 CHAPTER 17 ■ EXTENDING PYTHON
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558 APPENDIX B ■ PYTHON REFERENCE
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572 APPENDIX C ■ ONLINE RESOURCES
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Index ■Symbols - operator 558 !=
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■INDEX 595 Python C API 365 hand-
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Beginning Python - From Novice to Professional

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