4. Introduction to GUI Programming
- A Pop-Up Alert in 25 Lines
- An Expression Evaluator in 30 Lines
- A Currency Converter in 70 Lines
- Signals and Slots
In this chapter we begin with brief reviews of three tiny yet useful GUI applications written in PyQt. We will take the opportunity to highlight some of the issues involved in GUI programming, but we will defer most of the details to later chapters. Once we have a feel for PyQt GUI programming, we will discuss PyQt’s “signals and slots” mechanism—this is a high-level communication mechanism for responding to user interaction that allows us to ignore irrelevant detail.
Although PyQt is used commercially to build applications that vary in size from hundreds of lines of code to more than 100 000 ...
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