描述

Finding a File on the Python Search Path

在Python搜索路径上查找文件

Credit: Mitch Chapman

问题 Problem

A large Python application includes resource files (e.g., Glade project files, SQL templates, and images) as well as Python packages. You want to store these associated files together with the Python packages that use them.

大规模的Python应用程序包括资源文件(比如Glade?项目文件,SQL模板，图像文件等)和Python包。

解决 Solution

You need to be able to look for either files or directories along Python's sys.path:

import sys, os

class Error(Exception): pass

def _find(pathname, matchFunc=os.path.isfile):

for dirname in sys.path:
- candidate = os.path.join(dirname, pathname) if matchFunc(candidate):
  - return candidate
raise Error("Can't find file %s" % pathname)

def findFile(pathname):

return _find(pathname)

def findDir(path):

return _find(path, matchFunc=os.path.isdir)

讨论 Discussion

Larger Python applications consist of sets of Python packages and associated sets of resource files. It's convenient to store these associated files together with the Python packages that use them, and it's easy to do so if you use this variation on Recipe 4.21 to find files or directories with pathnames relative to the Python search path.

参考 See Also

Recipe 4.21; documentation for the os module in the Library Reference

PyCkBk-4-22

描述

问题 Problem

解决 Solution

讨论 Discussion

参考 See Also