ubuntu 21.04 can not found any version bpy from pip

[lucasjinreal]

pip install bpy gives me:

ollecting bpy
  Using cached https://pypi.tuna.tsinghua.edu.cn/packages/bc/e2/20c6d56f1143e13c0fc24a7d987ee28e4949b8edbbbb1b66f705d129bdc5/bpy-0.0.0a0.tar.gz (19 kB)
Building wheels for collected packages: bpy
  Building wheel for bpy (setup.py) ... \

0.0.0??

can not find a specific version:

ERROR: Could not find a version that satisfies the requirement bpy==2.82.1 (from versions: 0.0.0a0)
ERROR: No matching distribution found for bpy==2.82.1