Documentation in Practice

Estimated time: 15 minutes

Overview

Questions

• “What does developer documentation look like in practice?”
• “What does user documentation look like in practice?”

Objectives

• “Become familiar with real-life examples of documentation.”
• “Practice writing different kinds of documentation.”

Developer Documentation Examples

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Documentation Type	Explanation	Example
Team processes	This type of documentation documents the expected development processes within a team. These generally include an objective, stakeholders, and steps to follow.	US-RSE’23 Website Repository CONTRIBUTING guide
Styles and standards	This type of documentation states the expectations on styles and standards within a code. This can include preferred tools, usage of existing style guides, and project or domain-specific standards.	Pyomo’s Required Coding Standards
API	This type of documentation is both developer and user documentation. From a developer perspective, this documentation elaborates the intent of the code, e.g., what the code is supposed to be doing, which can improve maintainability.	Spack’s API Documentation

PRACTICE: Euler’s Method Documentation

Have you heard of Euler’s Method? It’s a way to calculate a numerical approximation for the value of a function, based on a starting value x_0, a particular step size h, and the derivative of the function.

Write some documentation for the following code snippet:

PYTHON

class EulersMethod:
    def deriv(self, x, y):
        return y**2 + y*x + x**3
    def approx(self, y, x, h):
        y_j = y + h*self.deriv(x, y)
        x_j = x + h
        return y_j, x_j

BONUS: How would you improve this code to make it more clear?

User Documentation Examples

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Documentation Type	Explanation	Example
Installation	This documentation is meant to help users get a package installed and working properly. Frequently, it will detail not only the different methods of installing the software, but also simple explanations of how to ensure it was installed correctly (e.g., a sanity test).	NumPy Installation Instructions
Debugging and troubleshooting	This type of documentation helps users troubleshoot common errors. This is normally built from previous questions or common mistakes, such as invalid setup, options, or inputs.	Pyomo Common Warnings and Errors
Tutorials and examples	This type of documentation is meant to show users, step-by-step, on either small or real-world scales, how a software package is supposed to be used. This documentation helps with clarifying the developers’ intended use and acts as a starting point for users.	Pandas Getting Started Tutorials

PRACTICE: Install Python

Assume that you have a new team member who does not have Python on their machine and wants to install it. They send you an email to ask how they should do it.

• Do you have all the information you need to answer this question? Why or why not?
• Given only the email, write instructions detailing how to install Python from python.org.

REMINDER: Culture, Context, Experience

Keep in mind culture, context, and experience when writing your instructions.

Key Points

• “There are numerous examples of different types of documentation in practice, each with its own intended purpose.”
• “A project must pick the documentation that makes the most sense for its use case and domain.”