Chapter 5. Modules
Whereas functions allow us to parcel up pieces of code so that they can be reused throughout a program, modules provide a means of collecting sets of functions (and as we will see in the next chapter, custom data types) together so that they can be used by any number of programs. Python also has facilities for creating packages—these are sets of modules that are grouped together, usually because their modules provide related functionality or because they depend on each other.
This chapter’s first section describes the syntaxes for importing functionality from modules and packages—whether from the standard library, or from our own custom modules and packages. ...
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