python – 无法导入Pandas：TypeError

https://github.com/pydata/pandas/releases/download/v0.15.0/pandas-0.15.0.win-amd64-py2.7.exe

但是我无法导入它：

import pandas as pd

Traceback (most recent call last):
  File "<pyshell#0>",line 1,in <module>
    import pandas as pd
  File "C:Python27libsite-packagespandas__init__.py",line 45,in <module>
    from pandas.io.api import *
  File "C:Python27libsite-packagespandasioapi.py",line 15,in <module>
    from pandas.io.gbq import read_gbq
  File "C:Python27libsite-packagespandasiogbq.py",line 39,in <module>
    if LooseVersion(_GOOGLE_API_CLIENT_VERSION >= '1.2.0'):
  File "C:Python27libdistutilsversion.py",line 265,in __init__
    self.parse(vstring)
  File "C:Python27libdistutilsversion.py",line 274,in parse
    self.component_re.split(vstring))
TypeError: expected string or buffer

怎么了？