I created project with only one dependency: fastapi==0.119.0 I assume there is some problem with the bytecode files. Maybe some .pyc files are missing or need to be recompiled. Python tries to compile ...

Hey @JackZhhhh, thanks for the report. I gave this a try locally, but couldn’t reproduce it. Could you share some details about your environment, like your pip version, Python version, and the output ...