在部署測試環境時，pip install XXX，出現瞭如下問題：

“File “/usr/lib/python2.7/site-packages/pkg_resources.py”, line 738, in comparison
raise SyntaxError(repr(cop)+” operator not allowed in environment markers”)
SyntaxError: ‘<' operator not allowed in environment markers
error in setup command: Error parsing /opt/stack/cinder/setup.cfg: SyntaxError: '<' operator not allowed in environment markers"

出現這個問題，應該是setuptools版本太舊，需要更新升級，可以執行如下命令來進行升級：

pip install --upgrade pip

pip install --upgrade setuptools