报如下错：
Installed /usr/local/python27/lib/python2.7/site-packages/rpy2-2.8.5-py2.7-linux-x86_64.egg Processing dependencies for rpy2==2.8.5 Searching for singledispatch Reading http://pypi.python.org/simple/singledispatch/ Download error: unknown url type: https -- Some packages may not be found! Couldn't find index page for 'singledispatch' (maybe misspelled?) Scanning index of all packages (this may take a while) Reading http://pypi.python.org/simple/ Download error: unknown url type: https -- Some packages may not be found! No local packages or download links found for singledispatch Best match: None Traceback (most recent call last): File "setup.py", line 414, in <module> 'rpy2': ['doc/source/rpy2_logo.png', ]} File "/usr/local/python27/lib/python2.7/distutils/core.py", line 151, in setup dist.run_commands() File "/usr/local/python27/lib/python2.7/distutils/dist.py", line 953, in run_commands self.run_command(cmd) File "/usr/local/python27/lib/python2.7/distutils/dist.py", line 972, in run_command cmd_obj.run() File "build/bdist.linux-x86_64/egg/setuptools/command/install.py", line 76, in run File "build/bdist.linux-x86_64/egg/setuptools/command/install.py", line 104, in do_egg_install File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 211, in run File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 427, in easy_install File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 478, in install_item File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 519, in process_distribution File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 563, in resolve File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 799, in best_match File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 811, in obtain File "build/bdist.linux-x86_64/egg/setuptools/command/easy_install.py", line 434, in easy_install File "build/bdist.linux-x86_64/egg/setuptools/package_index.py", line 475, in fetch_distribution AttributeError: 'NoneType' object has no attribute 'clone'
解决办法：
到以下链接https://pypi.python.org/simple/singledispatch/下载singledispatch-3.4.0.1.tar.gz