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1. The Software Development Process
From Problem to Maintained Program
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1
Specify → Implement → Analyze → Test → Design → Maintain
Design → Analyze → Implement → Specify → Maintain → Test
Analyze → Implement → Design → Maintain → Specify → Test
Analyze → Specify → Design → Implement → Test/Debug → Maintain
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There is no difference between them.
Specifications write the Python code; design tests it.
Specifications fix bugs; design maintains the program.
Specifications define what the program does; design defines how it does it.
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Finding and fixing program errors
Describing only the inputs and outputs
Collecting user requirements after the program is finished
Translating a design into a programming language
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Python does not allow programs to be completed.
Testing can never identify any error.
Programs evolve to meet changing user needs.
Specifications must always be written after implementation.
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