python NameError：全局名称'__file__'未定义

Question

当我在python 2.7中运行此代码时，出现此错误：

Traceback (most recent call last):

File "C:\Python26\Lib\site-packages\pyutilib.subprocess-3.5.4\setup.py", line 30, in <module>

    long_description = read('README.txt'),

  File "C:\Python26\Lib\site-packages\pyutilib.subprocess-3.5.4\setup.py", line 19, in read

    return open(os.path.join(os.path.dirname(__file__), *rnames)).read()

NameError: global name '__file__' is not defined

代码是：

import os

from setuptools import setup

def read(*rnames):

    return open(os.path.join(os.path.dirname(__file__), *rnames)).read()

setup(name="pyutilib.subprocess",

    version='3.5.4',

    maintainer='William E. Hart',

    maintainer_email='[e-mail]',

    url = 'https://software.sandia.gov/svn/public/pyutilib/pyutilib.subprocess',

    license = 'BSD',

    platforms = ["any"],

    description = 'PyUtilib utilites for managing subprocesses.',

    long_description = read('README.txt'),

    classifiers = [

        'Development Status :: 4 - Beta',

        'Intended Audience :: End Users/Desktop',

        'License :: OSI Approved :: BSD License',

        'Natural Language :: English',

        'Operating System :: Microsoft :: Windows',

        'Operating System :: Unix',

        'Programming Language :: Python',

        'Programming Language :: Unix Shell',

        'Topic :: Scientific/Engineering :: Mathematics',

        'Topic :: Software Development :: Libraries :: Python Modules'],

      packages=['pyutilib', 'pyutilib.subprocess', 'pyutilib.subprocess.tests'],

      keywords=['utility'],

      namespace_packages=['pyutilib'],

      install_requires=['pyutilib.common', 'pyutilib.services']

      )