Get the arguments based on the names.

def getArguments(names, local_dict=None, global_dict=None):
    """Get the arguments based on the names."""
    call_frame = sys._getframe(2)

    clear_local_dict = False
    if local_dict is None:
        local_dict = call_frame.f_locals
        clear_local_dict = True
    try:
        frame_globals = call_frame.f_globals
        if global_dict is None:
            global_dict = frame_globals

        # If `call_frame` is the top frame of the interpreter we can't clear its 
        # `local_dict`, because it is actually the `global_dict`.
        clear_local_dict = clear_local_dict and not frame_globals is local_dict

        arguments = []
        for name in names:
            try:
                a = local_dict[name]
            except KeyError:
                a = global_dict[name]
            arguments.append(numpy.asarray(a))
    finally:
        # If we generated local_dict via an explicit reference to f_locals,
        # clear the dict to prevent creating extra ref counts in the caller's scope
        # See https://github.com/pydata/numexpr/issues/310
        if clear_local_dict:
            local_dict.clear()

    return arguments