launchd执行python脚本,但导入失败

Question

我使用appscript编写了一个python脚本来跟踪我当前活动的窗口.我通过launchd运行它,但是当我这样做时它无法导入appscript.我已将plY中的PYTHONPATH设置为launchd,但我认为launchd不是在site-packages中读取.pth文件.有没有办法让它做到这一点？

我的脚本在这里:https://github.com/katylava/macwintracker

这是推出的plist:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>label</key>
    <string>com.katylavallee.wintracker</string>
    <key>ProgramArguments</key>
    <array>
        <string>/Users/kyl/Library/Application Support/com.katylavallee.wintracker/wintracker.py</string>
        <string>1</string>
        <string>1</string>
    </array>
    <key>Environment Variables</key>
    <dict>
      <key>PYTHONPATH</key>
      <string>/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages</string>
    </dict>
    <key>StandardErrorPath</key>
    <string>/Users/kyl/Library/Logs/com.katylavallee.wintracker/wintracker_err.log</string>
    <key>StandardOutPath</key>
    <string>/Users/kyl/Library/Logs/com.katylavallee.wintracker/wintracker.log</string>
    <key>StartInterval</key>
    <integer>3</integer>
  </dict>
</plist>

而错误:

Traceback (most recent call last):
  File "/Users/kyl/Library/Application Support/com.katylavallee.wintracker/wintracker.py", line 5, in <module>
    from appscript import app, its
ImportError: No module named appscript

python脚本从命令行运行良好.

Answer 1

有可能是系统Python(/usr/bin/python)正在启动以执行您的脚本,而不是/opt/local/bin/python2.6您appscript安装的MacPorts Python().什么应该工作(未经测试!)是Program Argument在脚本的路径之前插入MacPorts Python路径作为第一个.在这种情况下,您不需要指定PYTHONPATH.从理论上讲,只要MacPorts Python与系统Python兼容地配置(即类似的arch,部署目标等),你就可以完成你的工作,但你可能不应该或者需要沿着这条路走下去.

另一种方法是将脚本的shebang行(第一行)更改为MacPorts Python的explict路径:

#!/opt/local/bin/python2.6

这在命令行shell中工作的原因可能是你的一个shell配置文件,比如.bash_profile修改PATH环境变量,首先包含MacPorts Python(/opt/local/bin)的路径,以便首先/usr/bin/env python找到MacPython python.在运行时launchd,不涉及shell,因此PATH不会发生操作; 只搜索默认路径,意味着/usr/bin/env python执行/usr/bin/python.