Usually, the error module x has no attribute y means that:

1. Your working directory contains a x file, which collides with python’s x module
2. You are running a python script from a directory (thereby making it your current working directory) where file x collides with python’s x module

In this case, I have a selectors.py file in the same folder as the script I’m running, and therefore, when python wants to import its own selectors module, it gets mine, and fails.

So, either:

1. Rename your own file
2. Use -m to run script as a module
3. Move the script to another directory