<p>我刚刚创建了一个Google Cloud计算引擎，安装了带有pip和pip3的googlecloud包，在使用python3启动脚本时遇到以下错误</p>
<pre><code> from google.cloud import bigquery
File "/usr/local/lib/python3.5/dist-packages/google/cloud/bigquery/__init__.py", line 35,
in <module>
from google.cloud.bigquery.client import Client
File "/usr/local/lib/python3.5/dist-packages/google/cloud/bigquery/client.py", line 36, in
<module>
(more traceback lines..)
from pyasn1_modules.rfc2459 import Certificate
File "/usr/local/lib/python3.5/dist-packages/pyasn1_modules/rfc2459.py", line 20, in <modu
le>
from pyasn1.type import opentype
ImportError: cannot import name 'opentype'
</code></pre>
<p>在计算引擎上安装了以下软件包：</p>
<pre><code>pyasn1==0.1.9
pyasn1-modules==0.2.1
google-cloud==0.30.0
google-cloud-bigquery==0.28.0
</code></pre>
<p>哪一个可能是问题所在？</p>
