def _neg_impl(expr, op, **kw):
    return UnaryExpression(expr, operator=operators.neg)
The document ID.
dataset/ETHPy150Open zzzeek/sqlalchemy/lib/sqlalchemy/sql/default_comparator.py/_neg_impl--crossover with--dataset/ETHPy150Open djc/couchdb-python/couchdb/client.py/Document.id