'What are the @ symbols in pip freeze?

I typically work in conda on a Mac, but I find myself needing to use pip on Linux. I verified pip was in my conda env, and then created a requirements.txt file:

conda activate my_env
pip freeze > requirements.txt

The output in the requirements file looks like this:

appnope @ file:///opt/concourse/worker/volumes/live/4f734db2-9ca8-4d8b-5b29-6ca15b4b4772/volume/appnope_1606859466979/work
arcgis==1.9.0
argon2-cffi @ file:///opt/conda/conda-bld/argon2-cffi_1645000214183/work
argon2-cffi-bindings @ file:///opt/concourse/worker/volumes/live/c6f9b05d-dc80-4dbc-7473-70bfcb66883c/volume/argon2-cffi-bindings_1644569703264/work
async-generator==1.10
...

What do these @ symbols signify, and will this create issues when setting up pip envs on different operating systems?



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