熊猫0.18语法无效

Question

Python 3.2安装在Linux Debian 7下的虚拟环境（名为test3）中，pandas 0.18在此环境中安装了pip。测试程序：

import pandas as pd
print('Pandas version ' + pd.__version__)

导致以下错误：

Traceback (most recent call last):
File "pandatest.py", line 1, in <module>
import pandas as pd
File "/home/tad/Programming/testpanda/test3/lib/python3.2/site-packages/pandas/__init__.py", line 43, in <module>
from pandas.io.api import *
File "/home/tad/Programming/testpanda/test3/lib/python3.2/site-packages/pandas/io/api.py", line 17, in <module>
from pandas.io.packers import read_msgpack, to_msgpack
File "/home/tad/Programming/testpanda/test3/lib/python3.2/site-packages/pandas/io/packers.py", line 258
if compress == u'zlib':
                     ^
SyntaxError: invalid syntax

可能是什么原因？似乎以前没有人报告过，在网上找不到任何东西。