An error appears if you run ez_setup.py from command line

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Originally reported by: talantr (Bitbucket: talantr, GitHub: talantr)

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OS: CentOS 6.5/Debian 6.0.7;
Python: 2.6.6;
Setuptools 3.x;

Steps to reproduce:

Run the command from command line:

    curl -s https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py | sudo python

Actual result:

The console output:

    Downloading https://pypi.python.org/packages/source/s/setuptools/setuptools-3.0.zip
    Extracting in /tmp/tmpAKOE46

    Traceback (most recent call last):
      File "<stdin>", line 312, in <module>
      File "<stdin>", line 309, in main
      File "<stdin>", line 46, in _install
      File "/usr/lib64/python2.6/contextlib.py", line 16, in __enter__
        return self.gen.next()
      File "<stdin>", line 75, in archive_context
    AttributeError: ZipFile instance has no attribute '__exit__'

The package has not been installed.

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/157

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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I get the same error on Windows under Python 2.6.6.

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Restore support for Python 2.6 in bootstrap script. Fixes #157.

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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In order to prevent errors like this in the future, I've included an invocation of ez_setup.py in the continuous-integration tests.