def find_unit_clause(clauses, model):
    """Find a forced assignment if possible from a clause with only 1
    variable not bound in the model.
    >>> find_unit_clause([A|B|C, B|~C, ~A|~B], {A:True})
    (B, False)
    """
    for clause in clauses:
        P, value = unit_clause_assign(clause, model)
        if P: return P, value
    return None, None
def find_unit_clause(clauses, model):
    """Find a forced assignment if possible from a clause with only 1
    variable not bound in the model.
    >>> find_unit_clause([A|B|C, B|~C, ~A|~B], {A:True})
    (B, False)
    """
    for clause in clauses:
        P, value = unit_clause_assign(clause, model)
        if P: return P, value
    return None, None
def find_unit_clause ( clauses , model ) : for clause in clauses : P , value = unit_clause_assign ( clause , model ) if P : return P , value return None , None
Find a forced assignment if possible from a clause with only 1
    variable not bound in the model.
    >>> find_unit_clause([A|B|C, B|~C, ~A|~B], {A:True})
    (B, False)
Find a forced assignment if possible from a clause with only 1 variable not bound in the model . >>> find_unit_clause ( [ A|B|C B|~C ~A|~B ] { A : True } ) ( B False )