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# interp.py
import UserDict
class Chainmap(UserDict.DictMixin):
"""Combine multiple mappings for sequential lookup. Raymond Hettinger,
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/305268 """
def __init__(self, *maps):
self._maps = maps
def __getitem__(self, key):
for mapping in self._maps:
try:
return mapping[key]
except KeyError:
pass
raise KeyError(key)
import sys
from string import Template
def interp(text, repldic=None, safe_substitute=True):
caller = sys._getframe(1)
if repldic:
mapping = Chainmap(repldic, caller.f_locals, caller.f_globals)
else:
mapping = Chainmap(caller.f_locals, caller.f_globals)
t = Template(text)
if safe_substitute:
return t.safe_substitute(mapping)
else:
return t.substitute(mapping)
## Example:
language="Python"
def printmsg():
opinion = "favorite"
print interp("My $opinion language is $language.")
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