def category_label(arg, labels, nulls=None):
    op = CategoryLabel(arg, labels, nulls)
    return op.to_expr()
Patch L{pwd.getpwnam} so that it behaves as though only one user exists
dataset/ETHPy150Open cloudera/ibis/ibis/expr/analytics.py/category_label--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/test/test_twistd.py/patchUserDatabase