Python function for testing similarity of two DOIs

similar_doi.py

def similar_dois(d1, d2, accuracy=1.00):
    """Determine whether DOIs are similar.

    DOIs basically need to be identical, but are case insensitive.
    """
    if not (d1 and d2):
        return False
    d1 = d1.lower().strip()
    d2 = d2.lower().strip()
    return difflib.SequenceMatcher(None, d1, d2).ratio() == accuracy