As far as I know, there isn't a standard idiom to do this, but it's still a one-liner. Untested, but I think this should work:
import re
from htmlentitydefs import name2codepoint
def htmlentitydecode(s):
return re.sub('&(%s);' % '|'.join(name2codepoint), lambda m:
name2codepoint[m.group(1)], s)
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