尝试部署python应用程序时，Heroku deploy开始返回此错误：

-----> Installing requirements with pip
       Collecting amqp==2.6.1
         Downloading amqp-2.6.1-py2.py3-none-any.whl (48 kB)
       Collecting anyjson==0.3.3
         Downloading anyjson-0.3.3.tar.gz (8.3 kB)
         Preparing metadata (setup.py): started
         Preparing metadata (setup.py): finished with status 'error'
         error: subprocess-exited-with-error
         
         × python setup.py egg_info did not run successfully.
         │ exit code: 1
         ╰─> [1 lines of output]
             error in anyjson setup command: use_2to3 is invalid.
             [end of output]
         
         note: This error originates from a subprocess, and is likely not a problem with pip.
       error: metadata-generation-failed
       
       × 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.
 !     Push rejected, failed to compile Python app.
 !     Push failed

requirements.txt中没有变更