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from each match of the incident_re regular expression We then extract all the key=value strings in one go using the keyvalues match group, and apply the key_value_re regular expression s refinditer() method to iterate over each individual key=value line For each (key, value) pair found, we put them in the data dictionary so all the values go in as strings Then, for those values which should not be strings, we replace them with a value of the appropriate type using the same string conversions that we used when parsing the text manually We have added a check to ensure that the data dictionary has nine items because if an incident record is corrupt, the key_valuefinditer() iterator might match too many or too few key=value lines The end is the same as before we create a new Incident object and put it in the incidents dictionary, then return True If anything went wrong, the except suite will issue a suitable error message and return False, and the finally suite will close the le One of the things that makes both the manual and the regular expression text parsers as short and straightforward as they are is Python s exceptionhandling The parsers don t have to check any of the conversions of strings to dates, numbers, or Booleans, and they don t have to do any range checking (the Incident class does that) If any of these things fail, an exception will be raised, and we handle all the exceptions neatly in one place at the end Another bene t of using exception-handling rather than explicit checking is that the code scales well even if the record format changes to include more data items, the error handling code doesn t need to grow any larger

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well, such as the use of constants in case labels in switch statements; see 1349)

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Some programs use an XML le format for all the data they handle, whereas others use XML as a convenient import/export format The ability to import and export XML is useful and is always worth considering even if a program s main format is a text or binary format Out of the box, Python offers three ways of writing XML les: manually writing the XML, creating an element tree and using its write() method, and creating a DOM and using its write() method Similarly, for reading and parsing XML les there are four out-of-the-box approaches that can be used: manually reading and parsing the XML (not recommended and not covered here it can be quite dif cult to handle some of the more obscure and advanced details correctly), or using an element tree, DOM, or SAX parser In addition, there are also third-party XML libraries available, such as the lxml library mentioned in 5 (227 ), that are well worth investigating The aircraft incident XML format is shown in Figure 75 In this section we will show how to write this format manually and how to write it using an element tree and a DOM, as well as how to read and parse this format using the element

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LDAPVirtualListControl(int startIndex, int beforeCount, int afterCount, int contentCount) LDAPVirtualListControl(String jumpTo, int beforeCount, int afterCount)

One ought not to be thrown into confusion By a plain statement of relationship The Generations of Men 407

< xml version="10" encoding="UTF-8" > <incidents> <incident report_id="20070222008099G" date="2007-02-22" aircraft_id="80342" aircraft_type="CE-172-M" pilot_percent_hours_on_type="909090909091" pilot_total_hours="440" midair="0"> <airport>BOWERMAN</airport> <narrative> ON A GO-AROUND FROM A NIGHT CROSSWIND LANDING ATTEMPT THE AIRCRAFT HIT A RUNWAY EDGE LIGHT DAMAGING ONE PROPELLER </narrative> </incident> <incident> </incident> : </incidents>

Some servers (Novell Directory Services, for one) can process a request more ef ciently if they are supplied with a context cookie A cookie is returned by the server in a VLV response, and it should be provided in subsequent requests involving the same VLV search:

When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge of it is of a meager and unsatisfactory kind: it may be the beginning of knowledge, but you have scarcely, in your thoughts, advanced to the stage of science William Thompson, Lord Kelvin

tree, DOM, and SAX parsers If you don t care which approach is used to read or write the XML, you could just read the Element Trees subsection that follows, and then skip to the chapter s nal section (Random Access Binary Files; 324)

their side effects, such as assignments to variables, or for their values, which can be used as arguments or operands in larger expressions, or to affect the execution sequence in statements, or both This chapter speci es the meanings of expressions and the rules for their evaluation

Writing the data using an element tree is done in two phases: First an element tree representing the data must be created, and second the tree must be written to a le Some programs might use the element tree as their data structure, in which case they already have the tree and can simply write out the data We will look at the export_xml_etree() method in two parts:

public LDAPVirtualListControl(int startIndex, int beforeCount, int afterCount, int contentCount, String context)

When an expression in a program is evaluated (executed), the result denotes one of three things: A variable ( 412) (in C, this would be called an lvalue) A value ( 42, 43) Nothing (the expression is said to be void)

def export_xml_etree(self, filename): root = xmletreeElementTreeElement("incidents") for incident in selfvalues(): element = xmletreeElementTreeElement("incident", report_id=incidentreport_id, date=incidentdateisoformat(), aircraft_id=incidentaircraft_id, aircraft_type=incidentaircraft_type, pilot_percent_hours_on_type=str( incidentpilot_percent_hours_on_type), pilot_total_hours=str(incidentpilot_total_hours),

The class has accessors that can be used to get the current settings or to change them after the object has been constructed:

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