ERROR: Could not install packages due to an OSError: HTTPSConnectionPool(host=‘files.pythonhosted.or

问题展示：

 WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/60/53/619c0bcdc45b0a2ac94fc840c67073f8ca3f69344383c7dca0ed20e1ea73/pandas-1.5.1-cp39-cp39-win_amd64.whl
  WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/60/53/619c0bcdc45b0a2ac94fc840c67073f8ca3f69344383c7dca0ed20e1ea73/pandas-1.5.1-cp39-cp39-win_amd64.whl
  WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/60/53/619c0bcdc45b0a2ac94fc840c67073f8ca3f69344383c7dca0ed20e1ea73/pandas-1.5.1-cp39-cp39-win_amd64.whl
  WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/60/53/619c0bcdc45b0a2ac94fc840c67073f8ca3f69344383c7dca0ed20e1ea73/pandas-1.5.1-cp39-cp39-win_amd64.whl
  WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)')': /packages/60/53/619c0bcdc45b0a2ac94fc840c67073f8ca3f69344383c7dca0ed20e1ea73/pandas-1.5.1-cp39-cp39-win_amd64.whl
ERROR: Could not install packages due to an OSError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Max retries exceeded with url: /packages/60/53/619c0bcdc45b0a2ac94fc840c67073f8ca3f69344383c7dca0ed20e1ea73/pandas-1.5.1-cp39-cp39-win_amd64.whl (Caused by ConnectTimeoutError(, 'Connection to files.pythonhosted.org timed out. (connect timeout=15)'))

 pip install的时候出现这种问题，搜过一些文章，说是关闭代理，改镜像之类的

解决方法：不用校园网，哈哈哈哈，就用最普通的网即可