DIRTY_HACK.py

class Env(BaseEnv):
    def __init__(self, bindings=None):
        super().__init__({
            # syntactic forms
            'let': syntaxLet,
            'lambda': syntaxLambda,
            'quote': syntaxQuote,
            'exact-number': syntaxExact,
            'inexact-number': syntaxInexact,
            'set!': syntaxSetBang,
            'if': syntaxIf,
            # primitive functions
            'list': primList,
            '+': primPlus,
            '-': primMinus,
            '*': primTimes,
            '/': primDivide,
            'car': evaluate(read("(lambda ((x . y)) x)"), BaseEnv({ 'lambda': syntaxLambda })),
            'cdr': evaluate(read("(lambda ((x . y)) y)"), BaseEnv({ 'lambda': syntaxLambda })),
        })