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The line if data[:1] == _OKAY: is quite subtle Both the data object and the _OKAY object are of type bytes We want to compare the rst byte of the data object to the (1 byte) _OKAY object If we take a slice of a bytes object, we get a bytes object, but if we take a single byte, say, data[0], we get an int the byte s value So here we compare the 1 byte slice of data (its rst byte, the state byte) with the 1 byte _OKAY object (Another way of doing it would be to write if data[0] == _OKAY[0]: which would compare the two int values) At the end we rename the original le as the backup and rename the compacted le as the original We then remove the backup if keep_backup is False (the default) Finally, we open the compacted le (which now has the original lename), ready to be read or written The BinaryRecordFileBinaryRecordFile class is quite low-level, but it can serve as the basis of higher-level classes that need random access to les of xed-size records, as we will see in the next subsection

If S is a local class ( 143), then let O be the innermost lexically enclosing class of S Let n be an integer such that O is the nth lexically enclosing class of the class in which the class instance creation expression appears Then:

The BikeStock module uses a BinaryRecordFileBinaryRecordFile to provide a simple stock control class The stock items are bicycles, each represented by a BikeStockBike instance, and the entire stock of bikes is held in a BikeStockBikeStock instance The BikeStockBikeStock class aggregates a dictionary whose keys are bike IDs and whose values are record index positions, into a BinaryRecordFileBinaryRecordFile Here is a brief example of use to get a feel for how these classes work:

"available, number " + index + " requested: " + e ); } Debugprintln( 9, "DirNodegetChildAt: found <" + ((DirNode)node)getDN() + ">" ); return node; }

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If S occurs within a static context, then i has no immediately enclosing instance with respect to S Otherwise, if the class instance creation expression occurs in a static context, then a compile-time error occurs

bicycles = BikeStockBikeStock(bike_file) value = 00 for bike in bicycles: value += bikevalue bicyclesincrease_stock("GEKKO", 2) for bike in bicycles: if bikeidentitystartswith("B4U"):

LDAPConnection ldc = DirUtilgetLDAPConnection( "mantamcomcom", 389, "cn=directory manager", "password" ); TreePanel tree = new TreePanel( new DirModel( ldc ) );

Otherwise, S is an inner member class ( 85)

if not bicyclesincrease_stock(bikeidentity, 1): print("stock movement failed for", bikeidentity)

If the class instance creation expression is an unquali ed class instance creation expression, then:

Figure 10-13 shows TreePanel in the mode in which only container entries are displayed TreePanel is displayed in the application TestTree, which allows selection of various options from the command line: Display leaf nodes or only container nodes Show private suf xes or only public suf xes

This snippet opens a bike stock le and iterates over all the bicycle records it contains to nd the total value (sum of price quantity) of the bikes held It then increases the number of GEKKO bikes in stock by two and increments the stock held for all bikes whose bike ID begins with B4U by one All of these actions take place on disk, so any other process that reads the bike stock le will always get the most current data Although the BinaryRecordFileBinaryRecordFile works in terms of indexes, the BikeStockBikeStock class works in terms of bike IDs This is managed by the BikeStockBikeStock instance holding a dictionary that relates bike IDs to indexes We will begin by looking at the BikeStockBike class s class line and initializer, then we will look at a few selected BikeStockBikeStock methods, and nally we will look at the code that provides the bridge between BikeStockBike objects and the binary records used to represent them in a BinaryRecordFileBinaryRecordFile (All the code is in the BikeStockpy le)

If the class instance creation expression occurs in a static context, then a compile-time error occurs Otherwise, if S is a member of an enclosing class then let O be the innermost lexically enclosing class of which S is a member, and let n be an integer such that O is the nth lexically enclosing class of the class in which the class instance creation expression appears The immediately enclosing instance of i with respect to S is the nth lexically enclosing instance of this Otherwise, a compile-time error occurs

class Bike: def __init__(self, identity, name, quantity, price): assert len(identity) > 3, ("invalid bike identity '{0}'" format(identity)) self__identity = identity selfname = name selfquantity = quantity selfprice = price

Follow referrals or not Show only the tree or the tree together with a table of child entries If we want to display all nodes, including leaf nodes, then instantiation and initialization have to be done separately:

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