[Zope] Relative paths in Extensions folder

[Garikoitz Araolaza]

Hi!

Writing

p=open('myfile.txt','r')

in a Python module in Extensions folder doesn't work unless you give the 
whole absolute path for the file:

p=open('/usr/zope/2.5.0/Extensions/myfile.txt','r')

Is there any way to define relative paths to the files in Extensions, so 
that my app works in different systems?

(I was thinking about accessing the INSTANCE_HOME variable, for example...)

Thanks in advance

Gari


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