<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def default_is_local(hadoop_conf=None, hadoop_home=None):
 """\ Is Hadoop configured to use the local file system? By default, it is. A DFS must be explicitly configured. """

    params = pydoop.hadoop_params(hadoop_conf, hadoop_home)
    for k in 'fs.defaultFS', 'fs.default.name':
        if not params.get(k, 'file:').startswith('file:'):
            return False
    return True