"karlskoga","karlskrona","karlstad","katrineholm","kil","kinda","kiruna","klippan","knivsta","kramfors","kristianstad","kristinehamn","krokoms","kumla","kungsbacka","kungsör","kungälv","kävlinge","köping","laholm","landskrona","laxå","lekeberg","leksand","lerum","lessebo","lidingö","lidköping","lilla edets","lindesbergs","linköpings","ljungby","ljusdals","ljusnarsbergs","lomma","ludvika","luleå","lunds","lycksele","lysekil","malmö","malung-sälen","malå","mariestad","marks","markaryd","mellerud",...

Es kann sich um eine `async def`- oder normale `def`-Funktion handeln. **FastAPI** weiß, wie damit zu verfahren ist.

In diesem Fall schreibt die Taskfunktion in eine Datei (den Versand einer E-Mail simulierend).

Und da der Schreibvorgang nicht `async` und `await` verwendet, definieren wir die Funktion mit normalem `def`:

{* ../../docs_src/background_tasks/tutorial001.py hl[6:9] *}

## Thanks to our Contributors

This release contains contributions from many people at Google, as well as:

8bitmp3, Abhilash Majumder, abhilash1910, AdeshChoudhar, Adrian Garcia
Badaracco, Adrian Ratiu, ag.ramesh, Aleksandr Nikolaev, Alexander Bosch,
Alexander Grund, Annie Tallund, Anush Elangovan, Artem Sokolovskii, azazhu,
Balint Cristian, Bas Aarts, Ben Barsdell, bhack, cfRod, Cheney-Wang, Cheng Ren,