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... or working in an environment or on a problem for which functional patterns apply.
Suppose you are writing a "CRUD" app that writes to a relational database, how do you apply functional programming to that? The whole point of an application like that is that it makes side effects.
In some cases you can break those problems down into functional pieces. Consider Python drivers for a product like
https://www.arangodb.com/
One major problem is that you want drivers that work synchronously and asynchronously, the structure of the average api call is something like
def query(parameters):
Purely functional programming in package management and system configurations is next-level.[0] When your package installation scripts no longer are represented as actions from one state to another but as a state that is either realized completely or not, things become a lot more deterministic, manageable and compositional.
As an active user and package maintainer I can't count the number of times I've decided to rebuild an old project that I haven't touched in years and it still working, while in the same session working on another project using up to date libraries.
[0] https://nixos.org/