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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 pre(cond):
 """ Add a precondition check to the annotated method. The condition is passed the arguments from the annotated method. It does not need to accept all of the methods parameters. The condition is inspected to figure out which parameters to pass. """

    cond_args, cond_varargs, cond_varkw, cond_defaults = inspect.getargspec(cond)
    source = inspect.getsource(cond).strip()

    def inner(f):
        if enabled:
            # deal with the real function, not a wrapper
            f = getattr(f, 'wrapped_fn', f)

            # need to check if 'self' is the first arg,
            # since @pre doesn't want the self param
            member_function = is_member_function(f)

            # need metadata for checking defaults
            method_args, method_defaults = inspect.getargspec(f)[0::3]

            def check_condition(args, kwargs):
                cond_kwargs = {}

                if method_defaults is not None and len(method_defaults) > 0 \
                and len(method_args) - len(method_defaults) <= len(args) < len(method_args):
                    args += method_defaults[len(args) - len(method_args):]

                # collection the args
                for name, value in zip(cond_args, args[member_function:]):
                    cond_kwargs[name] = value

                # collect the remaining kwargs
                for name in cond_args:
                    if name not in cond_kwargs:
                        cond_kwargs[name] = kwargs.get(name)

                # test the precondition
                if not cond(**cond_kwargs):
                    # otherwise raise the exception
                    raise AssertionError('Precondition failure, %s' % source)

            # append to the rest of the preconditions attached to this method
            if not hasattr(f, 'preconditions'):
                f.preconditions = []
            f.preconditions.append(check_condition)

            return check(f)
        else:
            return f

    return inner