求助：执行pip install pylinac时PyPI连接超时且无匹配发行版

操作场景：打开Anaconda Prompt执行pip install pylinac，出现连接超时错误：

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPSConnection object at 0x000002F148845F60>, 'Connection to pypi.org timed out. (connect timeout=15)')': /simple/pylinac/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPSConnection object at 0x000002F148846230>, 'Connection to pypi.org timed out. (connect timeout=15)')': /simple/pylinac/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPSConnection object at 0x000002F148846530>, 'Connection to pypi.org timed out. (connect timeout=15)')': /simple/pylinac/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPSConnection object at 0x000002F148846620>, 'Connection to pypi.org timed out. (connect timeout=15)')': /simple/pylinac/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.HTTPSConnection object at 0x000002F1488467A0>, 'Connection to pypi.org timed out. (connect timeout=15)')': /simple/pylinac/
ERROR: Could not find a version that satisfies the requirement pylinac (from versions: none)
ERROR: No matching distribution found for pylinac
WARNING: There was an error checking the latest version of pip.

以下是可行的解决方法：

• 使用国内PyPI镜像源安装
  国内镜像源访问速度更快，避免超时。执行以下任意一条命令：

  # 清华镜像
  pip install pylinac -i https://pypi.tuna.tsinghua.edu.cn/simple --timeout=60
  # 阿里镜像
  pip install pylinac -i https://mirrors.aliyun.com/pypi/simple/ --timeout=60
  # 豆瓣镜像
  pip install pylinac -i https://pypi.douban.com/simple/ --timeout=60
  

  --timeout=60 是将超时时间延长到60秒，避免因网络波动导致失败。

• 通过conda安装
  既然使用Anaconda，直接用conda安装更适配，执行：

  conda install -c conda-forge pylinac
  

• 调整网络环境

  • 关闭当前代理软件（如果开启），部分代理会阻断PyPI连接
  • 切换到稳定网络（如手机热点），排除本地网络故障

• 手动下载安装包本地安装

  1. 下载对应系统和Python版本的pylinac安装包（.whl或.tar.gz格式）
  2. 打开Anaconda Prompt进入下载目录，执行：

  pip install 你的安装包文件名.whl
  

内容的提问来源于stack exchange，提问作者ruipe90