PygraphViz导入错误与PyCharm

我相信我已经在我的Debian版本上安装了pygraphviz。如果我从命令行运行Python，则可以导入它：

jon@debian:~/anaconda3/bin$ ipython
Python 3.5.1 |Continuum Analytics, Inc.| (default, Dec  7 2015, 11:17:45) 
Type "copyright", "credits" or "license" for more information.

IPython 4.1.2 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

In [1]: import pygraphviz

In [2]: 

但是，如果我从PyCharm的Python控制台尝试相同的操作，则会收到此错误：

/home/jon/anaconda3/bin/python /home/jon/apps/pycharm-community-5.0.4/helpers/pydev/pydevconsole.py 59089 41751
Python 3.5.1 |Anaconda 2.5.0 (32-bit)| (default, Dec  7 2015, 11:17:45) 
Type "copyright", "credits" or "license" for more information.

IPython 4.0.3 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.
PyDev console: using IPython 4.0.3

import sys; print('Python %s on %s' % (sys.version, sys.platform))
sys.path.extend(['/home/jon/PycharmProjects/StateMachine'])

Python 3.5.1 |Anaconda 2.5.0 (32-bit)| (default, Dec  7 2015, 11:17:45) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux
In[2]: import pygraphviz
Traceback (most recent call last):
  File "/home/jon/anaconda3/lib/python3.5/site-packages/IPython/core/interactiveshell.py", line 3066, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-2-99ed911275c0>", line 1, in <module>
    import pygraphviz
  File "/home/jon/apps/pycharm-community-5.0.4/helpers/pydev/pydev_import_hook.py", line 21, in do_import
    module = self._system_import(name, *args, **kwargs)
ImportError: No module named 'pygraphviz'

我注意到在第一个示例中，Python版本是

Python 3.5.1 |Continuum Analytics, Inc.| (default, Dec  7 2015, 11:17:45) 

而在第二个示例中，版本为：

Python 3.5.1 |Anaconda 2.5.0 (32-bit)| (default, Dec  7 2015, 11:17:45) 

因此，失败的第二个示例似乎是32位的（请注意，为什么要安装32位版本？）

我的/ anaconda3 / envs文件夹为空。

据我所知，我在Conda中仅安装了一个Python环境。

所以我的问题是...为什么导入在PyCharm中失败，为什么当我只安装一个版本时却似乎运行32位版本的Python？