'Check to see if user is assigning to a var for the first time, in
which case we want to avoid any sort of automagic / autocall games.
This allows users to assign to either alias or magic names true python
variables (the magic/alias systems always take second seat to true
python code).  E.g. ls=\'hi\', or ls,that=1,2'

def check(self, line_info):

    if line_info.the_rest:
        if (line_info.the_rest[0] in '=,'):
            return self.prefilter_manager.get_handler_by_name('normal')
    else:
        return None
