python - Dictionary of directories -

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i have paths (simplified): /rootfolder/subfolder_1/subsubfolder_1/

paths = {     'rootfolder':'rootfolder/'     'subfolder_1':paths[rootfolder]+'subfolder/'     'subsubfolder_1:paths[subfolder]+'subsubfolder/' }

basically, want static dictionary of paths, want keep dependencies can make 1 change in future. unsure if that's doable, , if, how? have better ideas mine? in advance help.

you can use functions values keys. because functions not called before dict constructed, there'll no nameerror. 

in [320]: paths = { 'root': lambda: '/', 'usr': lambda: os.path.join(paths['root'](), 'usr')}  in [321]: paths['root']() out[321]: '/'  in [322]: paths['usr']() out[322]: '/usr'  in [323]: paths['root'] = lambda: '//'  in [324]: paths['usr']() out[324]: '//usr'

if don't want paths['root'](), subclass dict. 

from types import functiontype import os  class dyndict(dict):     def __getitem__(self, key):         val = dict.__getitem__(self, key)         return val() if type(val) functiontype else val  paths = dyndict(root='/', tmp=lambda: os.path.join(paths['root'], 'tmp')) print(paths['root'], paths['tmp']) paths['root'] = '/var/' print(paths['root'], paths['tmp'])

output;

/ /tmp /var/ /var/tmp

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