在尝试使用pip安装wechat_sender时遇到错误：Permission denied: '/Library/Python/2.7/site-packages/singledispatch.py'。解决方案包括使用sudo权限安装或修改目录权限。可以运行命令：sudo chmod +a 'user:YOUR_USER_NAME allow add_subdirectory,add_file,delete_child,directory_inherit' /Library/Python/2.7/site-packages，并将YOUR_USER_NAME替换为实际用户名。"
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安装wechat_sender 出错：
Permission denied: '/Library/Python/2.7/site-packages/singledispatch.py'
pip install wechat_sender
查百度得到：
Your account does not have write access to this directory?.
- If the installation directory is a system-owned directory, you may need to sign in as the administrator or "root" account.
sudo pip install virtualenv
- If you do not have administrative access to this machine, you may wish to choose a different installation directory, preferably one that is listed in your PYTHON_PATH environment variable.
- easier way: change that dir permission:
chmod +a 'user:YOUR_USER_NAME allow add_subdirectory,add_file,delete_child,directory_inherit' /Library/Python/2.7/site-packages
解决方法：sudo chmod +a 'user:YOUR_USER_NAME allow add_subdirectory,add_file,delete_child,directory_inherit' /Library/Python/2.7/site-packages
YOUR_USER_NAME 改为自己的用户名，
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