最近要用python2.7的，安装虚拟环境时发生了下边的错误：
CondaHTTPError: HTTP 404 NOT FOUND for url <https://pypi.doubanio.com/simple/noarch/repodata.json> Elapsed: 00:00.124769 The remote server could not find the noarch directory for the requested channel with url: https://pypi.doubanio.com/simple As of conda 4.3, a valid channel must contain a `noarch/repodata.json` and associated `noarch/repodata.json.bz2` file, even if `noarch/repodata.json` is empty. please request that the channel administrator create `noarch/repodata.json` and associated `noarch/repodata.json.bz2` files. $ mkdir noarch $ echo '{}' > noarch/repodata.json $ bzip2 -k noarch/repodata.json You will need to adjust your conda configuration to proceed. Use `conda config --show channels` to view your configuration's current state. Further configuration help can be found at <https://conda.io/docs/config.html>.