not all variables in the scope of con are assigned in the assignment it ignores variables in assignment that are not in the scope of the constraint in pythonthe notation is used for unpacking tuple for examplef(*( )is the same as ( so if has value ( )then (*tis the same as ( cspproblem py -(continued def can_evaluate(selfassignment)""assignment is variable:value dictionary returns true if the constraint can be evaluated given assignment ""return all( in assignment for in self scope def holds(self,assignment)"""returns the value of constraint con evaluated in assignment preconditionall variables are assigned in assignmentie self can_evaluate(assignmentis true ""return self condition(*tuple(assignment[vfor in self scope)csps constraint satisfaction problem (csprequiresvariablesa list or set of variables constraintsa set or list of constraints other properties are inferred from thesevariables is the set of variables var to const is mapping from variables to set of constraintssuch that var to const[varis the set of constraints with var in the scope cspproblem py -(continued class csp(object)""" csp consists of title ( stringvariablesa set of variables constraintsa list of constraints var_to_consta variable to set of constraints dictionary ""def __init__(selftitlevariablesconstraints)"""title is string variables is set of variables constraints is list of constraints version june