Fail with pip

[malinkinsa]

After using
pip install -r requirements.txt

Have an error:

ERROR: Could not find a version that satisfies the requirement json (from -r requirements.txt (line 3)) (from versions: none)
ERROR: No matching distribution found for json (from -r requirements.txt (line 3))

Removing json from requirements.txt and all work fine.
Python has a built-in JSON module. If that's what you're looking for. Just import in your script or shell