我已按照此处[http://www.pyimagesearch.com/2015/07/20/install-opencv-3-0-and-python-3-4-on-ubuntu/]中的说明操作，以便安装python3。我正在使用Ubtuno 12.04。检查我的python版本后，我有：
$ python --version
Python 2.7.3
$ python3 --version
Python 3.2.3
在第2步中，我使用：
$ wget https://bootstrap.pypa.io/get-pip.py
$ sudo python3 get-pip.py
但是在运行第二行后我收到以下错误：
/tmp/tmp4ijset/pip.zip/pip/_vendor/pkg_resources/__init__.py:80: UserWarning: Support for Python 3.0-3.2 has been dropped. Future versions will fail here.
Traceback (most recent call last):
File "get-pip.py", line 19177, in <module>
main()
File "get-pip.py", line 194, in main
bootstrap(tmpdir=tmpdir)
File "get-pip.py", line 82, in bootstrap
import pip
File "/tmp/tmp4ijset/pip.zip/pip/__init__.py", line 16, in <module>
File "/tmp/tmp4ijset/pip.zip/pip/vcs/mercurial.py", line 9, in <module>
File "/tmp/tmp4ijset/pip.zip/pip/download.py", line 36, in <module>
File "/tmp/tmp4ijset/pip.zip/pip/utils/ui.py", line 15, in <module>
File "/tmp/tmp4ijset/pip.zip/pip/_vendor/progress/bar.py", line 48
empty_fill = u'∙'
^
SyntaxError: invalid syntax