Using cached https://pypi.tuna.tsinghua.edu.cn/packages/cf/44/cc9590db23758ee7906d40cacff06c02a21c2a6166602e095a56cbf2f6f6/tornado-6.1.tar.gz (497 kB)
Preparing metadata (setup.py) … error
× python setup.py egg_info did not run successfully.
│ exit code: 1
╰─> [1 lines of output]
ERROR: Can not execute
setup.py since setuptools is not available in the build environment.
[end of output]
note: This error originates from a subprocess, and is likely not a problem with pip.
× Encountered error while generating package metadata.
╰─> See above for output.
note: This is an issue with the package mentioned above, not pip.
hint: See above for details.