Under python2.7

sudo python2.7 -m easy_install -U twisted
[sudo] password for jacekf: 
Searching for twisted
Reading http://pypi.python.org/simple/twisted/
Reading http://www.twistedmatrix.com
Reading http://twistedmatrix.com/products/download
Reading http://twistedmatrix.com/
Reading http://tmrc.mit.edu/mirror/twisted/Twisted/9.0/
Reading http://twistedmatrix.com/projects/core/
Reading http://tmrc.mit.edu/mirror/twisted/Twisted/8.1/
Reading http://tmrc.mit.edu/mirror/twisted/Twisted/8.2/
Reading http://tmrc.mit.edu/mirror/twisted/Twisted/10.0/
Best match: Twisted 11.1.0
Downloading http://pypi.python.org/packages/source/T/Twisted/Twisted-11.1.0.tar.bz2#md5=972f3497e6e19318c741bf2900ffe31c
Processing Twisted-11.1.0.tar.bz2
Running Twisted-11.1.0/setup.py -q bdist_egg --dist-dir /tmp/easy_install-YBvWK_/Twisted-11.1.0/egg-dist-tmp-zIO__W
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/local/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "build/bdist.linux-i686/egg/easy_install.py", line 5, in <module>
  File "build/bdist.linux-i686/egg/setuptools/command/easy_install.py", line 1712, in main
  File "build/bdist.linux-i686/egg/setuptools/command/easy_install.py", line 1700, in with_ei_usage
  File "build/bdist.linux-i686/egg/setuptools/command/easy_install.py", line 1716, in <lambda>
  File "/usr/local/lib/python2.7/distutils/core.py", line 152, in setup
    dist.run_commands()
  File "/usr/local/lib/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/usr/local/lib/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "build/bdist.linux-i686/egg/setuptools/command/easy_install.py", line 211, in run
  File "build/bdist.linux-i686/egg/setuptools/command/easy_install.py", line 446, in easy_install
  File "build/bdist.linux-i686/egg/setuptools/command/easy_install.py", line 476, in install_item
  File "build/bdist.linux-i686/egg/setuptools/command/easy_install.py", line 655, in install_eggs
  File "build/bdist.linux-i686/egg/setuptools/command/easy_install.py", line 930, in build_and_install
  File "build/bdist.linux-i686/egg/setuptools/command/easy_install.py", line 919, in run_setup
  File "build/bdist.linux-i686/egg/setuptools/sandbox.py", line 62, in run_setup
  File "build/bdist.linux-i686/egg/setuptools/sandbox.py", line 105, in run
  File "build/bdist.linux-i686/egg/setuptools/sandbox.py", line 64, in <lambda>
  File "setup.py", line 103, in <module>
  File "setup.py", line 74, in main
  File "setup.py", line 31, in getExtensions
  File "twisted/topfiles/setup.py", line 21, in <module>
ImportError: cannot import name _isCPython

Under PyPy, same errors as before:

pypy -m easy_install -U twisted
Searching for twisted
Reading http://pypi.python.org/simple/twisted/
Reading http://www.twistedmatrix.com
Reading http://twistedmatrix.com/products/download
Reading http://twistedmatrix.com/
Reading http://tmrc.mit.edu/mirror/twisted/Twisted/9.0/
Reading http://twistedmatrix.com/projects/core/
Reading http://tmrc.mit.edu/mirror/twisted/Twisted/8.1/
Reading http://tmrc.mit.edu/mirror/twisted/Twisted/8.2/
Reading http://tmrc.mit.edu/mirror/twisted/Twisted/10.0/
Best match: Twisted 11.1.0
Downloading http://pypi.python.org/packages/source/T/Twisted/Twisted-11.1.0.tar.bz2#md5=972f3497e6e19318c741bf2900ffe31c
Processing Twisted-11.1.0.tar.bz2
Running Twisted-11.1.0/setup.py -q bdist_egg --dist-dir /tmp/easy_install-K4bVb9/Twisted-11.1.0/egg-dist-tmp-e8Q1QN
Traceback (most recent call last):
  File "app_main.py", line 53, in run_toplevel
  File "/home/jacekf/bin/pypy-1.6/lib-python/2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/home/jacekf/bin/pypy-1.6/lib-python/2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/easy_install.py", line 5, in <module>
    main()
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/command/easy_install.py", line 1864, in main
    with_ei_usage(lambda:
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/command/easy_install.py", line 1845, in with_ei_usage
    return f()
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/command/easy_install.py", line 1868, in <lambda>
    distclass=DistributionWithoutHelpCommands, **kw
  File "/home/jacekf/bin/pypy-1.6/lib-python/modified-2.7/distutils/core.py", line 152, in setup
    dist.run_commands()
  File "/home/jacekf/bin/pypy-1.6/lib-python/modified-2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/home/jacekf/bin/pypy-1.6/lib-python/modified-2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/command/easy_install.py", line 345, in run
    self.easy_install(spec, not self.no_deps)
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/command/easy_install.py", line 585, in easy_install
    return self.install_item(spec, dist.location, tmpdir, deps)
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/command/easy_install.py", line 615, in install_item
    dists = self.install_eggs(spec, download, tmpdir)
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/command/easy_install.py", line 805, in install_eggs
    return self.build_and_install(setup_script, setup_base)
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/command/easy_install.py", line 1082, in build_and_install
    self.run_setup(setup_script, setup_base, args)
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/command/easy_install.py", line 1071, in run_setup
    run_setup(setup_script, args)
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/sandbox.py", line 30, in run_setup
    lambda: execfile(
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/sandbox.py", line 72, in run
    return func()
  File "/home/jacekf/bin/pypy-1.6/site-packages/distribute-0.6.19-py2.7.egg/setuptools/sandbox.py", line 32, in <lambda>
    {'__file__':setup_script, '__name__':'__main__'}
  File "setup.py", line 103, in <module>
  File "setup.py", line 45, in main
ImportError: cannot import name 'copyright'

Sorry :-(

Jacek