I installed Uvicorn with pip install uvicorn but I can't run it from command line. I'm on Ubuntu 18.04.2 LTS
I'm guessing you mean that the shell you're using is unable to find the uvicorn executable.
If you did a user install, the executable probably ended up in ~/.local/bin/. If it's there, you'll probably want to add that directory to your PATH.
Didnt find command uvicorn in macos
the following worked for me:
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Didnt find command uvicorn in macos