<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def read_yaml(self, filename):
        '''
        Reads and parses a YAML file and returns the content.
        '''
        with open(filename, 'r') as f:
            d = re.sub(r'\{\{ *([^ ]+) *\}\}', r'\1', f.read())
            y = yaml.safe_load(d)
            return y if y else {}