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Python Programming: An Introduction to Computer Science

Python Programming: An Introduction to Computer Science. Chapter 2. The Software Development Process. Analyze the Problem Determine Specification Create a Design Implement Design Test/Debug the Program Maintain Program. Example Program: Temperature Converter. Problem:

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Python Programming: An Introduction to Computer Science

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  1. Python Programming:An Introduction toComputer Science Chapter 2 Python Programming, 2/e

  2. The Software Development Process • Analyze the Problem • Determine Specification • Create a Design • Implement Design • Test/Debug the Program • Maintain Program Python Programming, 2/e

  3. Example Program: Temperature Converter • Problem: • A US student in Europe needs to know what the temperature is in Fahrenheit. Python Programming, 2/e

  4. Example Program: Temperature Converter • Analysis – the temperature is given in Celsius, user wants it expressed in degrees Fahrenheit. • Specification • Input – temperature in Celsius • Output – temperature in Fahrenheit • Output = 9/5(input) + 32 Python Programming, 2/e

  5. Example Program: Temperature Converter • Design • Input, Process, Output (IPO) • Prompt the user for input (Celsius temperature) • Process it to convert it to Fahrenheit using F = 9/5(C) + 32 • Output the result by displaying it on the screen Python Programming, 2/e

  6. Example Program: Temperature Converter • Before we start coding, let’s write a rough draft of the program in pseudocode • Pseudocode is precise English that describes what a program does, step by step. Python Programming, 2/e

  7. Example Program: Temperature Converter • Pseudocode: • Input the temperature in degrees Celsius (call it celsius) • Calculate fahrenheit as (9/5)*celsius+32 • Output fahrenheit • Now we need to convert this to Python! Python Programming, 2/e

  8. Example Program: Temperature Converter #convert.py # A program to convert Celsius temps to Fahrenheit # by: Susan Computewell def main(): celsius = eval(input("What is the Celsius temperature? ")) fahrenheit = (9/5) * celsius + 32 print("The temperature is ",fahrenheit," degrees Fahrenheit.") main() Python Programming, 2/e

  9. Example Program: Temperature Converter • Once we write a program, we should test it! >>> What is the Celsius temperature? 0 The temperature is 32.0 degrees Fahrenheit. >>> main() What is the Celsius temperature? 100 The temperature is 212.0 degrees Fahrenheit. >>> main() What is the Celsius temperature? -40 The temperature is -40.0 degrees Fahrenheit. >>> Python Programming, 2/e

  10. Example Program: Temperature Converter • Problem: • A US student in Europe needs to know the average distance between three cities in miles. • 1 Kilometer = 0.62 Mile Python Programming, 2/e

  11. The Software Development Process • Analyze the Problem • Determine Specification • Create a Design • Implement Design • Test/Debug the Program • Maintain Program Python Programming, 2/e

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