Oops, I left some redundant cruft in the function... here it is
slightly cleaner:
def expand(dikt):
names = {}
output = {}
def _search(_, sourceDict):
for key, value in sourceDict.items():
if isinstance(value, dict):
_search({}, value)
if not '$' in value:
names[key] = value
_search({}, dikt)
def _substitute(targetDict, sourceDict):
for key, value in sourceDict.items():
if isinstance(value, dict):
new_target = targetDict.setdefault(key, {})
_substitute(new_target, value)
else:
targetDict[key] =
Template(value).substitute(names)
_substitute(output, dikt)
return output
print expand(d2)
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