By John E Grayson
This ebook comprises complete documentation for Tkinter, and likewise deals large examples for plenty of real-world Python/Tkinter functions that may supply programmers a short commence on their lonesome initiatives.
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Extra resources for Python and Tkinter Programming
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MyNameSpace except: return 'Error' and then the code is exec’ed in the except clause. Notice how this is enclosed by another try... except clause. 2 shows the results of clicking keys on the calculator to calculate simple math equations. Unlike many calculators, this displays the input and output in different colors. The display also scrolls to provide a history of calculations, not unlike a printing calculator. If you click on the display screen, you may input data directly. Here is the surprise: you can enter Python and have exec run the code.
After all, the Python interpreter is utilizing the Tkinter module which, in turn, relies on the _tkinter interface which calls Tcl and Tk libraries and sometimes calls the Tcl interpreter to bind properties to widgets. Well, this is all true, but on modern systems it really does not matter too much. If you follow the guidelines in “Programming for performance” on page 348, you will find that Python and Tkinter have the ability to deliver viable applications. If your reason for using Python/Tkinter is to develop prototypes for applications, then the point is somewhat moot; you will develop prototypes quickly in Python/Tkinter.
Similarly, Pmw options and methods are documented in Appendix C. Uses these appendices to determine the full range of options for each widget. 1 Tkinter widget tour The following widget displays show typical Tkinter widget appearance and usage. The code is kept quite short, and it illustrates just a few of the options available for the widgets. Sometimes one or more of a widget’s methods will be used, but this only scratches the surface. If 31 you need to look up a particular method or option, refer to appendix B.