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We begin by iterating over all the les in the program s directory If this is the current directory, ospathdirname(__file__) will return an empty string which would cause oslistdir() to raise an exception, so we pass "" if necessary For each candidate le (ends with py and contains the text magic ), we get the module name by chopping off the le extension If the name is a valid identi er it is a viable module name, and if it isn t already in the global list of modules maintained in the sysmodules dictionary we can try to import it We read the text of the le into the code string The next line, module = type(sys)(name), is quite subtle When we call type() it returns the type object of the object it is given So if we called type(1) we would get int back If we print the type object we just get something human readable like int , but if we call the type object as a function, we get an object of that type back For example, we can get the integer 5 in variable x by writing x = 5, or x = int(5), or x = type(0)(5), or int_type = type(0); x = int_type(5) In this case we ve used type(sys) and sys is a module, so we get back the module type object (essentially the same as a class object), and can use it to create a new module with the given name Just as with the int example where it didn t matter what integer we used to get the int type object, it doesn t matter what module we use (as long as it is one that exists, that is, has been imported) to get the module type object Once we have a new (empty) module, we add it to the global list of modules to prevent the module from being accidentally reimported This is done before calling exec() to more closely mimic the behavior of the import statement Then we call exec() to execute the code we have read and we use the module s dictionary as the code s context At the end we add the module to the list of modules we will pass back And if a problem arises, we delete the module from the global modules dictionary if it has been added it will not have been added to the list of modules if an error occurred Notice that exec() can handle any.

public int getCode() { return m_code; } /** * Gets the status report delivered with the e-mail message * @return the status report delivered with the e-mail message */ public String getMessage() { return m_message; } /** * Parses the BER-encoded value of m_value */ private void parseResponse() { // Suck out the data and parse it ByteArrayInputStream inStream = new ByteArrayInputStream( getValue() ); BERSequence ber = new BERSequence(); JDAPBERTagDecoder decoder = new JDAPBERTagDecoder(); int[] nRead = new int[1]; nRead[0] = 0; try { // A sequence BERSequence seq = (BERSequence)BERElementgetElement( decoder, inStream, nRead ); // First is the result code, then the message m_code = ((BERInteger)seqelementAt( 0 ))getValue(); BEROctetString str = (BEROctetString)seqelementAt( 1 ); m_message = new String(strgetValue(), "UTF8"); } catch(Exception x) { m_code = -1; m_message = null; } } private int m_code = -1; private String m_message = null; }

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public static void main(String[] args) { Systemoutprintln(favorite()mountain); } }

Syntax __import__() compile(source, file, mode) delattr(obj, name) dir(obj) eval(source, globals, locals) exec(obj, globals, locals) getattr(obj, name, val) globals() hasattr(obj, name) locals() setattr(obj, name, val) type(obj) vars(obj)

It is not likely you will nd a server that accepts or returns our new e-mail controls anytime soon unless you write a server extension yourself, which is beyond the scope of this book

It compiles, executes, and prints:

Imports a module by name; see text Returns the code object that results from compiling the source text; file should be the lename, or "<string>"; mode must be single , eval , or exec Deletes the attribute called name from object obj Returns the list of names in the local scope, or if obj is given then obj s names (eg, its attributes and methods) Returns the result of evaluating the single expression in source; if supplied, globals is the global context and locals is the local context (as dictionaries) Evaluates object obj, which can be a string or a code object from compile(), and returns None; if supplied, globals is the global context and locals is the local context Returns the value of the attribute called name from object obj, or val if given and there is no such attribute Returns a dictionary of the current global context Returns True if object obj has an attribute called name Returns a dictionary of the current local context Sets the attribute called name to the value val for the object obj, creating the attribute if necessary Returns object obj s type object Returns object obj s context as a dictionary; or the local context if obj is not given

15112 Accessing Superclass Members using super The special forms using the keyword super are valid only in an instance method, instance initializer or constructor, or in the initializer of an instance variable of a class; these are exactly the same situations in which the keyword this may be used ( 1583) The forms involving super may not be used anywhere in the class Object, since Object has no superclass; if super appears in class Object, then a compile-time error results Suppose that a eld access expression supername appears within class C , and the immediate superclass of C is class S Then supername is treated exactly as if it had been the expression ((S)this)name ; thus, it refers to the eld named name of the current object, but with the current object viewed as an instance of the superclass Thus it can access the eld named name that is visible in class S , even if that eld is hidden by a declaration of a eld named name in class C The use of super is demonstrated by the following example:

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