bpy_post_install: command not found

[zhanglin233]

Describe the bug
When I use "pip install bpy==2.91a0 && bpy_post_install" to install bpy,it reminds me that
" bpy_post_install: command not found"

WARNING: Requirement 'bpy-2.91a0-cp37-cp37m-manylinux2014_x86_64.whl' looks like a filename, but the file does not exist
Looking in indexes: http://mirrors.tencent.com/pypi/simple
Requirement already satisfied: bpy==2.91a0 from file:///mnt/ngr_data/music_dance_generation/stephxu/code/music_dance_generation/autogf/bpy-2.91a0-cp37-cp37m-manylinux2014_x86_64.whl in /usr/local/python3/lib/python3.7/site-packages (2.91a0)
Requirement already satisfied: numpy in /usr/local/python3/lib/python3.7/site-packages (from bpy==2.91a0) (1.21.5)
WARNING: You are using pip version 20.1.1; however, version 22.0.4 is available.
You should consider upgrading via the '/usr/local/python3/bin/python3.7 -m pip install --upgrade pip' command.
bash: bpy_post_install: command not found