I am working on a Ubuntu system which has both Python 2.7 and Python 3.4 installed. I was trying to install the ddt library for creating data driven test cases. However when I try installing using pip:

pip install ddt

I get the following error :

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main status = self.run(options, args)
File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 283, in run requirement_set.install(install_options, global_options, root=options.root_path)
File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1436, in install requirement.install(install_options, global_options, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/pip/req.py", line 672, in install self.move_wheel_files(self.source_dir, root=root)
File "/usr/lib/python2.7/dist-packages/pip/req.py", line 902, in move_wheel_files 
File "/usr/lib/python2.7/dist-packages/pip/wheel.py", line 206, in move_wheel_files clobber(source, lib_dir, True)
File "/usr/lib/python2.7/dist-packages/pip/wheel.py", line 193, in clobber os.makedirs(destsubdir)
File "/usr/lib/python2.7/os.py", line 157, in makedirs mkdir(name, mode)
OSError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/ddt-1.0.0.dist-info'

Storing debug log for failure in /home/rahul/.pip/pip.log  

The second last line points me in the direction that pip is trying to install ddt for Python 2.7, which I don't want.

How do I install ddt for Python 3.4?

  • There will be two versions of pip on your system, one for 2.7 and one for 3.4. It sounds like the 2.7 version is being used, probably through a symlink somewhere on your path. See stackoverflow.com/q/2812520/3376926.
    – tsleyson
    Aug 5, 2015 at 18:46
  • Thank you. I suppose this is what I needed at that time. :) Aug 6, 2015 at 2:28

2 Answers 2


The way I corrected this was to manually copy the ddt files from




Copied the following two files :



and the directory


If any body could come up with a better solution, then please add your answer. It would be more than welcome :)


You should have used the pip3 executable instead:

pip3 install ddt

(might require sudo).

  • This one works but at that time I was not aware of pip3. Although your answer works too. Dec 21, 2016 at 8:00

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