pip3 install couchdbkit 失败，出现“命令”python setup.py egg_info”

我无法在 ubuntu 中安装 couchdbkit。命令：pip3 install couchdbkit给出以下错误：

Collecting couchdbkit
  Using cached couchdbkit-0.6.5.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-_302m_0e/couchdbkit/setup.py", line 25, in <module>
        long_description = file(
    NameError: name 'file' is not defined

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-_302m_0e/couchdbkit/

如果还有其他方法可以在 ubuntu 中安装 couchdbkit，请指导我。