Track 10 · Lesson 6 of 12

Writing your own modules

Split a program into several .py files, import your own modules, and understand what module-level code does and when it runs.

You will be able to

• Explain why larger programs are split into modules, and decide what belongs in each file
• Import functions and constants from your own .py files in the same folder
• Predict when module-level code runs and how module state is shared
• Avoid name clashes such as shadowing a module or copying a value that later changes