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Programming Python, 3rd Edition
book

Programming Python, 3rd Edition

by Mark Lutz
August 2006
Intermediate to advanced content levelIntermediate to advanced
1600 pages
51h 46m
English
O'Reilly Media, Inc.
Content preview from Programming Python, 3rd Edition

GuiStreams: Redirecting Streams to Widgets

The script in Example 11-9 arranges to map input and output sources to pop-up windows in a GUI application, much as we did with strings in the stream redirection topics in Chapter 3. Although this module is really just a first-cut prototype and needs improvement itself (e.g., each input line request pops up a new input dialog), it demonstrates the concepts in general.

Its GuiOutput and GuiInput objects define methods that allow them to masquerade as files in any interface that expects a real file. As we learned earlier in Chapter 3, this includes standard stream processing tools, such as print and raw_input, and it includes explicit read and write calls. The two top-level interfaces in this module handle common use cases:

  • The redirectedGuiFunc function uses this plug-and-play file compatibility to run a function with its standard input and output streams mapped completely to pop-up windows rather than to the console window (or wherever streams would otherwise be mapped in the system shell).

  • The redirectedGuiShellCmd function similarly routes the output of a spawned shell command line to a pop-up window. It can be used to display the output of any program in a GUI—including that printed by a Python program.

The module’s GuiInput and GuiOutput classes can also be used or customized directly by clients that need more fine-grained control over the process.

Example 11-9. PP3E\Gui\Tools\guiStreams.py

############################################################################## ...
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Publisher Resources

ISBN: 0596009259Supplemental ContentErrata Page