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the data and decoding the bytes as UTF-8 (In theory, we could replace the last two lines with return datadecode("utf8"), but we prefer to go through the unpacking process since it is possible though unlikely that the s format performs some transformation on our data which must be reversed when reading back) We will now look at the rest of the import_binary() method, breaking it into two parts for ease of explanation

unless E1 is the class Exception Exception parameters cannot be referred to using quali ed names ( 66), only by simple names Exception handlers are considered in left-to-right order: the earliest possible catch clause accepts the exception, receiving as its actual argument the thrown exception object A finally clause ensures that the finally block is executed after the try block and any catch block that might be executed, no matter how control leaves the try block or catch block Handling of the finally block is rather complex, so the two cases of a try statement with and without a finally block are described separately

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fh = None try: fh = open(filename, "rb") magic = fhread(len(GZIP_MAGIC)) if magic == GZIP_MAGIC: fhclose() fh = gzipopen(filename, "rb") else: fhseek(0) magic = fhread(len(MAGIC)) if magic != MAGIC: raise ValueError("invalid aib file format") version = fhread(len(FORMAT_VERSION)) if version > FORMAT_VERSION: raise ValueError("unrecognized aib file version") selfclear()

The program begins by parsing the command-line arguments for the required host name and port number and for any options specifying particular schema elements to print:

If the run-time type of V is not assignable to the parameter of any catch clause of the try statement, then the try statement completes abruptly because of a throw of the value V

The le may or may not be compressed, so we use the same technique that we used for reading pickles to open the le using gzipopen() or the built-in open() function Once the le is open and we are at the beginning, we read the rst four bytes (len(MAGIC)) If these don t match our magic number we know that it isn t a binary aircraft incident data le and so we raise a ValueError exception Next we read in the 2-byte version number It is at this point that we would use different reading code depending on the version Here we just check that the version isn t a later one than this program is able to read If the magic number is correct and the version is one we can handle, we are ready to read in the data, so we begin by clearing out all the existing incidents so that the dictionary is empty

If execution of the try block completes abruptly for any other reason, then the try statement completes abruptly for the same reason

/** * Fetch the schema from the LDAP server at the specified * host and port, and print out the schema (including descriptions * of its object classes, attribute types, and matching rules) * The schema is printed in an easily readable format (not the * same as the format expected by an LDAP server) For example, * you can enter the following command to print the schema: * <PRE> * java netscapeldapLDAPSchema myhostmydomaincom 389 * </PRE> * Options are:<BR> * -D AUTHDN Use this DN to authenticate<BR> * -w AUTHPASSWORD Use this password to authenticate<BR> * -o OBJECTCLASS Print the definition of an object class<BR> * -a ATTRIBUTE Print the definition of an attribute<BR> * -m MATCHINGRULE Print the definition of a matching rule<BR> *<BR> * The default is to print all schema elements<BR> * * @param args the host name and the port number of the LDAP server * (eg, netscapeldapLDAPSchema directorynetscapecom 389) */ public static void main( String[] args ) { String host = null; int port = -1; String authDN = null; String authPassword = null; Vector attrList = new Vector(); Vector ocList = new Vector(); Vector matchList = new Vector(); for( int i = 0; i < argslength; i++ ) { if ( args[i]startsWith( "-" ) ) { if ( i > (argslength - 2) ) { doUsage(); Systemexit( 1 ); } if ( args[i]equals( "-a" ) ) { i++; attrListaddElement( args[i] );

while True: report_id = unpack_string(fh, False) if report_id is None: break data = {} data["report_id"] = report_id for name in ("airport", "aircraft_id", "aircraft_type", "narrative"): data[name] = unpack_string(fh) other_data = fhread(NumbersStructsize) numbers = NumbersStructunpack(other_data) data["date"] = datetimedatefromordinal(numbers[0]) data["pilot_percent_hours_on_type"] = numbers[1] data["pilot_total_hours"] = numbers[2] data["midair"] = numbers[3] incident = Incident(**data) self[incidentreport_id] = incident return True

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