human
Solve the following python programming problem given the following code:
@ classmethod 
def setup_class(cls) : 
    from sqlalchemy import literal 
    symbols = ('usd', 'gbp', 'cad', 'eur', 'aud') 
    currency_lookup = dict ((((currency_from, currency_to), Decimal (str (rate))) for (currency_to, values) in zip (symbols, [(1, 1.59009, 0.988611, 1.37979, 1.02962), (0.628895, 1, 0.621732, 0.867748, 0.647525), (1.01152, 1.6084, 1, 1.39569, 1.04148), (0.724743, 1.1524, 0.716489, 1, 0.746213), (0.971228, 1.54434, 0.960166, 1.34009, 1)]) for (currency_from, rate) in zip (symbols, currency_to))) 
    class Amount (object) : 
        def __init__(self, amount, currency) : 
            self.currency = currency 
            self.amount = amount 
def __add__(self, other) : 
            return Amount ((self.amount + other.as_currency (self.currency).amount), self.currency) 
def __sub__(self, other) : 
            return Amount ((self.amount - other.as_currency (self.currency).amount), self.currency) 
def __lt__(self, other) : 
            return (self.amount < other.as_currency (self.currency).amount) 
def __gt__(self, other) : 
            return (self.amount > other.as_currency (self.currency).amount) 
def __eq__(self, other) : 
            return (self.amount == other.as_currency (self.currency).amount) 
def as_currency(self, other_currency) : 
            return Amount ((currency_lookup [(self.currency, other_currency)] * self.amount), other_currency) 
def __clause_element__(self) : 
            if isinstance (self.amount, (float, int, Decimal)) : 
                return literal (self.amount) 
else : 
                return self.amount 
def __str__(self) : 
            return ('%2.4f %s' % (self.amount, self.currency)) 
def __repr__(self) : 
            return ('Amount(%r, %r)' % (self.amount, self.currency)) 
Base = declarative_base () 
    class BankAccount (Base) : 
        __tablename__ = 'bank_account' 
        id = Column (Integer, primary_key = True) 
        _balance = Column ('balance', Numeric) 
        @ hybrid.hybrid_property 
        def balance(self) : 
            'Return...

    
    

    Fix the buggy line: currency_lookup = dict ((((currency_from, currency_to), Decimal (str (rate))) for (currency_to, values) in zip (symbols, [(1, 1.59009, 0.988611, 1.37979, 1.02962), (0.628895, 1, 0.621732, 0.867748, 0.647525), (1.01152, 1.6084, 1, 1.39569, 1.04148), (0.724743, 1.1524, 0.716489, 1, 0.746213), (0.971228, 1.54434, 0.960166, 1.34009, 1)]) for (currency_from, rate) in zip (symbols, currency_to)))
assistant
#Here is Python program to fix the buggy line: currency_lookup = dict ((((currency_from, currency_to), Decimal (str (rate))) for (currency_to, values) in zip (symbols, [(1, 1.

currency_lookup = dict ((((currency_from, currency_to), Decimal (str (rate))) for (currency_to, values) in zip (symbols, [(1, 1.59009, 0.988611, 1.37979, 1.02962), (0.628895, 1, 0.621732, 0.867748, 0.647525), (1.01152, 1.6084, 1, 1.39569, 1.04148), (0.724743, 1.1524, 0.716489, 1, 0.746213), (0.971228, 1.54434, 0.960166, 1.34009, 1)]) for (currency_from, rate) in zip (symbols, values)))