ERROR: Could not find a version that satisfies the requirement transformer (from versions: none)ERR

Could not fetch URL https://pypi.org/simple/transformer/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/transformer/ (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: self-signed certificate (_ssl.c:1129)'))) - skipping

当你使用conda或pip命令出现这些问题，并且很疑惑明明在官网copy的命令和版本怎么就找不到呢？

并伴随上段错误内容的时候，不用怀疑别的，一定是你网的问题，进不去外网了，检查自己网络或者服务器网络。