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---
name: before-adding-a-new-module
description: Use before adding a new Python module to a package
---
# One module, one subject
A new module earns its place when it has a subject a sentence can name.
- If the sentence needs an "and", it is two modules.
- Put it beside the modules it will be imported with, not in a new package of
its own until there are three of them.
- Give it a one-line statement of purpose at the top, written for somebody who
arrived from a search result and has no other context.
A module that only exists to hold one function usually belongs inside the
module that calls it.
