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import re
keyword_rx = re.compile('^\$(\w+)\:\s+(\W+)\s*\$$')
# returns tuple (key, value)
# returns None if kwstring is not a keyword expansion
def extract_keyvalue(kwstring):
mo = keyword_rx.match(kwstring)
if mo is None: return None
try:
return mo.group(1,2)
except IndexError:
return None
def keywords(*kwstrings):
dict([extract_kwvalue(kws) for kws in kwstrings])
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