擅长:python、mysql、java
<p>您应该不使用任何前缀:</p>
<pre><code>class DefaultConfig(object):
class S3(object):
DATA_ROOT = 's3://%(bucket_name)s/NAS'
DATA_LOCATION = '{}/%(instrument_id)s/%(run_id)s'.format(DATA_ROOT)
print DefaultConfig.S3.DATA_LOCATION
</code></pre>
<p>退货:</p>
<pre><code>> s3://%(bucket_name)s/NAS/%(instrument_id)s/%(run_id)s
</code></pre>