Using str in Java

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Using str
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format()
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with mapping unpacking 81
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A more robust alternative to using positional arguments with their index positions as eld names, is to use the dictionary returned by locals(), a technique we saw earlier in the chapter
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equation = ("{a}x\N{SUPERSCRIPT TWO} + {b}x + {c} = 0" " \N{RIGHTWARDS ARROW} x = {x1}")format(**locals())
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And if we are using Python 31, we could omit the eld names and leave Python to populate the elds using the positional arguments passed to strformat()
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equation = ("{}x\N{SUPERSCRIPT TWO} + {}x + {} = 0" " \N{RIGHTWARDS ARROW} x = {}")format(a, b, c, x1)
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This is convenient, but not as robust as using named parameters, nor as versatile if we needed to use format speci cations Nonetheless, for many simple cases this syntax is both easy and useful
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csv2htmlpy
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One common requirement is to take a data set and present it using HTML In this subsection we will develop a program that reads a le that uses a simple CSV (Comma Separated Value) format and outputs an HTML table containing the le s data Python comes with a powerful and sophisticated module for handling CSV and similar formats the csv module but here we will write all the code by hand The CSV format we will support has one record per line, with each record divided into elds by commas Each eld can be either a string or a number Strings must be enclosed in single or double quotes and numbers should be unquoted unless they contain commas Commas are allowed inside strings, and must not be treated as eld separators We assume that the rst record contains eld labels The output we will produce is an HTML table with text left-aligned (the default in HTML) and numbers right-aligned, with one row per record and one cell per eld The program must output the HTML table s opening tag, then read each line of data and for each one output an HTML row, and at the end output the HTML table s closing tag We want the background color of the rst row (which will display the eld labels) to be light green, and the background of the data rows to alternate between white and light yellow We must also make sure that the special HTML characters ( & , < , and > ) are properly escaped, and we want strings to be tidied up a bit Here s a tiny piece of sample data:
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"COUNTRY","2000","2001",2002,2003,2004 "ANTIGUA AND BARBUDA",0,0,0,0,0
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"ARGENTINA",37,35,33,36,39 "BAHAMAS, THE",1,1,1,1,1 "BAHRAIN",5,6,6,6,6
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2 Data Types
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Assuming the sample data is in the le data/co2-samplecsv, and given the command csv2htmlpy < data/co2-samplecsv > co2-samplehtml, the le co2-samplehtml will have contents similar to this:
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<table border='1'><tr bgcolor='lightgreen'> <td>Country</td><td align='right'>2000</td><td align='right'>2001</td> <td align='right'>2002</td><td align='right'>2003</td> <td align='right'>2004</td></tr> <tr bgcolor='lightyellow'><td>Argentina</td> <td align='right'>37</td><td align='right'>35</td> <td align='right'>33</td><td align='right'>36</td> <td align='right'>39</td></tr> </table>
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We ve tidied the output slightly and omitted some lines where indicated by ellipses We have used a very simple version of HTML HTML 4 transitional, with no style sheet Figure 27 shows what the output looks like in a web browser
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Figure 27 A csv2htmlpy table in a web browser
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Now that we ve seen how the program is used and what it does, we are ready to review the code The program begins with the import of the sys module; we won t show this, or any other imports from now on, unless they are unusual or warrant discussion And the last statement in the program is a single function call:
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main()
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Although Python does not need an entry point as some languages require, it is quite common in Python programs to create a function called main() and to call it to start off processing Since no function can be called before it has been created, we must make sure we call main() after the functions it relies on have