MacOS下pip安装Python包提示找不到python3.7路径的问题求助

问题描述 #

我在MacOS系统上使用pip安装部分Python包（例如requests-html）时，频繁遇到路径错误，提示找不到/usr/local/opt/python/bin/python3.7。当前Python版本为3.10.6，pip已升级至最新版。

安装requests-html时的报错： #

louis@louis ~ % python3 -m pip install requests-html
Collecting requests-html
  Using cached requests_html-0.10.0-py3-none-any.whl (13 kB)
Collecting parse
  Downloading parse-1.19.0.tar.gz (30 kB)
  ERROR: Error [Errno 2] No such file or directory: '/usr/local/opt/python/bin/python3.7' while executing command python setup.py egg_info
  Preparing metadata (setup.py) ... error
ERROR: Could not install packages due to an OSError: [Errno 2] No such file or directory: '/usr/local/opt/python/bin/python3.7'

当前Python版本： #

louis@Louis ~ % python3 --version
Python 3.10.6

更新信息 #

检查/usr/local/opt/python/bin/目录，发现存在python3.7文件，但指定python3.10执行安装仍报错：

louis@Louis ~ % python3.10 -m pip install requests-html
Collecting requests-html
  Using cached requests_html-0.10.0-py3-none-any.whl (13 kB)
Collecting w3lib
  Downloading w3lib-2.1.1-py3-none-any.whl (21 kB)
Collecting pyppeteer>=0.0.14
  Using cached pyppeteer-1.0.2-py3-none-any.whl (83 kB)
Collecting pyquery
  Using cached pyquery-1.4.3-py3-none-any.whl (22 kB)
Collecting bs4
  Using cached bs4-0.0.1.tar.gz (1.1 kB)
  ERROR: Error [Errno 2] No such file or directory: '/usr/local/opt/python/bin/python3.7' while executing command python setup.py egg_info
  Preparing metadata (setup.py) ... error
ERROR: Could not install packages due to an OSError: [Errno 2] No such file or directory: '/usr/local/opt/python/bin/python3.7'

解决建议 #

1. 修复Python3.7的可执行权限 #

目录中存在python3.7文件但无法调用，可能是缺少可执行权限，执行以下命令添加权限：

chmod +x /usr/local/opt/python/bin/python3.7

2. 重新创建Python3.7的软链接 #

如果python3.7是无效文件或指向错误路径，先确认系统中Python3.7的实际位置，再重新创建软链接：

# 先查找系统中Python3.7的真实路径
which python3.7
# 假设找到的路径是/usr/local/bin/python3.7，执行以下命令创建软链接
ln -sf /usr/local/bin/python3.7 /usr/local/opt/python/bin/python3.7

如果系统未安装Python3.7，可通过Homebrew安装：

brew install python@3.7

3. 强制pip使用当前Python环境 #

设置环境变量，让pip明确使用当前Python3.10的解释器，避免调用旧版本：

export PYTHONPATH=$(python3.10 -c "import sys; print(':'.join(sys.path))")
export PATH=$(dirname $(which python3.10)):$PATH
# 再次执行安装命令
python3.10 -m pip install requests-html

4. 使用虚拟环境隔离依赖 #

创建Python3.10专属的虚拟环境，在干净环境中安装包，避免全局环境冲突：

# 创建虚拟环境
python3.10 -m venv myenv
# 激活虚拟环境
source myenv/bin/activate
# 安装目标包
pip install requests-html

5. 修改包源码中的硬编码路径 #

部分旧包的setup.py会硬编码Python路径，可手动下载源码修改后本地安装：

# 下载requests-html源码包（不下载依赖）
pip download requests-html --no-deps
# 解压源码包
tar -xzf requests-html-0.10.0.tar.gz
cd requests-html-0.10.0
# 替换setup.py中的Python3.7路径为当前Python3.10路径
sed -i '' 's/\/usr\/local\/opt\/python\/bin\/python3.7/\/usr\/local\/opt\/python\/bin\/python3.10/g' setup.py
# 本地安装修改后的包
pip install .

内容的提问来源于stack exchange，提问作者L.S