I need to use python "mock" library for unit testing.
Is it possible to install the library without connecting my development machine to the Internet?
Thx in advance.
Finally I managed to install "mock" offline. 
Step-by-step guide follows (I use Python 2.7):

Download necessary packages provided in .tar.gz archives:
mock, setuptools, pbr, six, funcsigs
Unpack all of the archives
Install modules one by one in the following order: setuptools, pbr, six, funcsigs, mock. To install a module, chdir to the folder it was unpacked to and execute      python setup.py install
Python mock offline standalone installation