第486页 | Learning Python | 阅读 ‧ 电子书库

Configuring the Search Path

The net effect of all of this is that both the PYTHONPATH and path file components of the search path allow you to tailor the places where imports look for files. The way you set environment variables and where you store path files varies per platform. For instance, on Windows, you might use your Control Panel’s System icon to set PYTHONPATH to a list of directories separated by semicolons, like this:

c:\pycode\utilities;d:\pycode\package1

Or you might instead create a text file called C:\Python30\pydirs.pth, which looks like this:

c:\pycode\utilities
d:\pycode\package1

These settings are analogous on other platforms, but the details can vary too widely for us to cover in this chapter. See Appendix A for pointers on extending your module search path with PYTHONPATH or .pth files on various platforms.