pip install -e '.[dev]' ERROR

[pioneerRick]

pip install -e '.[dev]'
得到了这个结果
ERROR: '.[dev]' is not a valid editable requirement. It should either be a path to a local project or a VCS URL (beginning with bzr+http, bzr+https, bzr+ssh, bzr+sftp, bzr+ftp, bzr+l
p, bzr+file, git+http, git+https, git+ssh, git+git, git+file, hg+file, hg+http, hg+https, hg+ssh, hg+static-http, svn+ssh, svn+http, svn+https, svn+svn, svn+file).
这是怎么回事?

[Setitch]

try to use ".[dev]" instead