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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def forwardCheck(self, variables, domains, assignments, _unassigned=Unassigned):
 """ Helper method for generic forward checking Currently, this method acts only when there's a single unassigned variable. @param variables: Variables affected by that constraint, in the same order provided by the user @type variables: sequence @param domains: Dictionary mapping variables to their domains @type domains: dict @param assignments: Dictionary mapping assigned variables to their current assumed value @type assignments: dict @return: Boolean value stating if this constraint is currently broken or not @rtype: bool """

        unassignedvariable = _unassigned
        for variable in variables:
            if variable not in assignments:
                if unassignedvariable is _unassigned:
                    unassignedvariable = variable
                else:
                    break
        else:
            if unassignedvariable is not _unassigned:
                # Remove from the unassigned variable domain's all
                # values which break our variable's constraints.
                domain = domains[unassignedvariable]
                if domain:
                    for value in domain[:]:
                        assignments[unassignedvariable] = value
                        if not self(variables, domains, assignments):
                            domain.hideValue(value)
                    del assignments[unassignedvariable]
                if not domain:
                    return False
        return True