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For developing GUI programs that must run on any or all Python desktop platforms (eg, Windows, Mac OS X, and Linux), using only a standard Python installation with no additional libraries, there is just one choice: Tk If it is possible to use third-party libraries the number of options opens up considerably One route is to get the WCK (Widget Construction Kit, wwweffbotorg/zone/wckhtm) which provides additional Tk-compatible functionality including the ability to create custom widgets whose contents are drawn in code The other choices don t use Tk and fall into two categories, those that are speci c to a particular platform and those that are cross-platform Platform-speci c GUI libraries can give us access to platform-speci c features, but at the price of locking us in to the platform The three most well-established crossplatform GUI libraries with Python bindings are PyGtk (wwwpygtkorg), PyQt (wwwriverbankcomputingcom/software/pyqt), and wxPython (wwwwxpythonorg) All three of these offer far more widgets than Tk, produce better-looking GUIs (although the gap has narrowed with Tk 85 and even more with Ttk), and make it possible to create custom widgets drawn in code All of them are easier to learn and use than Tk and all have more and much better Python-oriented documentation than Tk And in general, programs that use PyGtk, PyQt, or wxPython need less code and produce better results than programs written using Tk (At the time of this writing, PyQt had already been ported to Python 3, but the ports of both wxPython and PyGtk were still being done) Yet despite its limitations and frustrations, Tk can be used to build useful GUI programs IDLE being the most well known in the Python world Furthermore, Tk development seems to have picked up lately, with Tk 85 offering theming which makes Tk programs look much more native, as well as the welcome addition of many new widgets The purpose of this chapter is to give just a avor of Tk programming for serious GUI development it is best to skip this chapter (since it shows the vintage Tk approach to GUI programming), and to use one of the alternative libraries But if Tk is your only option for example, if your users have only a standard Python installation and cannot or will not install a third-party GUI library then realistically you will need to learn enough of the Tcl language to be able to read Tk s documentation In the following sections we will use Tk to create two GUI programs The rst is a very small dialog-style program that does compound interest calculations The second is a more elaborate main-window-style program that manages a list of bookmarks (names and URLs) By using such simple data we can.

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If S is not a final class ( 811), then, if there exists a supertype X of T, and a supertype Y of S, such that both X and Y are provably distinct parameterized types, and that the erasures of X and Y are the same, a compiletime error occurs Otherwise, the cast is always legal at compile time (because even if S does not implement T, a subclass of S might)

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Systemoutprintln( "Object serialized " + "Size = " + infolength + " bytes" ); // Write to directory err = writeObject( ld, PREFS_DN, "thePrefs", info ); if ( err != 0 ) { Systemoutprintln( "Error writing to " + PREFS_DN + ": " + err ); } else { Systemoutprintln( "Object stored at " + PREFS_DN ); } } } catch ( IOException e ) { Systemoutprintln( etoString() ); } } // Done, so disconnect if ( (ld != null) && ldisConnected() ) { try { lddisconnect(); } catch ( LDAPException e ) { Systemoutprintln( etoString() ); } } Systemexit( err ); }

The only Python/Tk book known to the author is Python and Tkinter Programming by John Grayson, ISBN 1884777813, published in 2000; it is out of date in some areas A good Tcl/Tk book is Practical Programming in Tcl and Tk by Brent Welch and Ken Jones, ISBN 0130385603 All the Tcl/Tk documentation is online at wwwtcltk, and tutorials can be found at wwwtkdocscom

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If T is a type variable, then this algorithm is applied recursively, using the upper bound of T in place of T If T is an array type, then S must be the class Object, or a compile-time error occurs

concentrate on the GUI programming aspects without distraction In the coverage of the bookmarks program we will see how to create a custom dialog, and how to create a main window with menus and toolbars, as well as how to combine them all together to create a complete working program Both of the example programs use pure Tk, making no use of the Ttk and Tix libraries, so as to ensure compatibility with Python 30 It isn t dif cult to convert them to use Ttk, but at the time of this writing, some of the Ttk widgets provide less support for keyboard users than their Tk cousins, so while Ttk programs might look better, they may also be less convenient to use But before diving into the code, we must review some of the basics of GUI programming since it is a bit different from writing console programs Python console programs and module les always have a py extension, but for Python GUI programs we use a pyw extension (module les always use py, though) Both py and pyw work ne on Linux, but on Windows, pyw ensures that Windows uses the pythonwexe interpreter instead of pythonexe, and this in turn ensures that when we execute a Python GUI program, no unnecessary console window will appear Mac OS X works similarly to Windows, using the pyw extension for GUI programs

The createEntry method creates an entry in the directory the rst time we need to write the values to it:

If S is an interface type:

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