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pros and cons for each format and for each way of handling them We show all of them to help you make an informed decision on a case-by-case basis Binary formats are usually very fast to save and load and they can be very compact Binary data doesn t need parsing since each data type is stored using its natural representation Binary data is not human readable or editable, and without knowing the format in detail it is not possible to create separate tools to work with binary data Text formats are human readable and editable, and this can make text les easier to process with separate tools or to change using a text editor Text formats can be tricky to parse and it is not always easy to give good error messages if a text le s format is broken (eg, by careless editing) XML formats are human readable and editable, although they tend to be verbose and create large les Like text formats, XML formats can be processed using separate tools Parsing XML is straightforward (providing we use an XML parser rather than do it manually), and some parsers have good error reporting XML parsers can be slow, so reading very large XML les can take a lot more time than reading an equivalent binary or text le XML includes metadata such as the character encoding (either implicitly or explicitly) that is not often provided in text les, and this can make XML more portable than text les Text formats are usually the most convenient for end-users, but sometimes performance issues are such that a binary format is the only reasonable choice However, it is always useful to provide import/export for XML since this makes it possible to process the le format with third-party tools without preventing the most optimal text or binary format being used by the program for normal processing.

Implementing Transactions (Operation Behavior)

Format Binary Binary Binary Binary Plain text Plain text XML XML XML Reader/Writer Pickle (gzip compressed) Pickle Manual (gzip compressed) Manual Regex reader/manual writer Manual Element tree DOM SAX reader/manual writer Reader + Writer Lines of Code 20 + 16 20 + 16 60 + 34 60 + 34 39 + 28 53 + 28 37 + 27 44 + 36 55 + 37 Total Lines of Code = = = = = = = = = 36 36 94 94 67 81 64 80 92

ArrayIndexOutOfBoundsException [View full width]

Output File Size (~KB) 160 416 132 356 436 436 460 460 464

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This chapter s rst three sections all use the same data collection: a set of aircraft incident records Figure 71 shows the names, data types, and validation constraints that apply to aircraft incident records It doesn t really matter what data we are processing The important thing is that we learn to process the fundamental data types including strings, integers, oating-point numbers, Booleans, and dates, since if we can handle these we can handle any other kind of data By using the same set of aircraft incident data for binary, text, and XML formats, it makes it possible to compare and contrast the different formats and the code necessary for handling them Figure 72 shows the number of lines of code for reading and writing each format, and the totals The le sizes are approximate and based on a particular sample of 596 aircraft incident records Compressed binary le sizes for the same data saved under different lenames may vary by a few bytes since the lename is included in the compressed data and lename lengths vary Similarly, the XML le sizes vary slightly since some XML writers use entities (" for " and ' for ') for quotes inside text data, and others don t The rst three sections all quote code from the same program: convert-incidentspy This program is used to read aircraft incident data in one format and to write it in another format Here is the program s console help text (We have reformatted the output slightly to t the book s page width)

The client code for this example is shown in Listing 516 The client is unaware of the transaction on the service

The data we used is based on real aircraft incident data available from the FAA (US government s Federal Aviation Administration, wwwfaagov)

Object Throwable Exception RuntimeException IndexOutOfBoundsException ArrayIndexOutOfBoundsException

Reads aircraft incident data from infile and writes the data to outfile The data formats used depend on the file extensions: aix is XML, ait is text (UTF-8 encoding), aib is binary, aip is pickle, and html is HTML (only allowed for the outfile) All formats are platform-independent Options: -h, --help show this help message and exit -f, --force write the outfile even if it exists [default: off] -v, --verbose report results [default: off] -r READER, --reader=READER reader (XML): 'dom', 'd', 'etree', 'e', 'sax', 's' reader (text): 'manual', 'm', 'regex', 'r' [default: etree for XML, manual for text] -w WRITER, --writer=WRITER writer (XML): 'dom', 'd', 'etree', 'e', 'manual', 'm' [default: manual] -z, --compress compress aib/aip outfile [default: off] -t, --test execute doctests and exit (use with -v for verbose)

The options are more complex than would normally be required since an end-user will not care which reader or writer we use for any particular format In a more realistic version of the program the reader and writer options would not exist and we would implement just one reader and one writer for each format Similarly, the test option exists to help us test the code and would not be present in a production version The program de nes one custom exception:

Implementing Transactions (Operation Behavior)

Aircraft incidents are held as Incident objects Here is the class line and the initializer:

class Incident: def __init__(self, report_id, date, airport, aircraft_id, aircraft_type, pilot_percent_hours_on_type, pilot_total_hours, midair, narrative=""): assert len(report_id) >= 8 and len(report_idsplit()) == 1, \ "invalid report ID" self__report_id = report_id selfdate = date selfairport = airport selfaircraft_id = aircraft_id selfaircraft_type = aircraft_type selfpilot_percent_hours_on_type = pilot_percent_hours_on_type

ArrayIndexOutOfBoundsException() ArrayIndexOutOfBoundsException(int index) ArrayIndexOutOfBoundsException(String s)

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