This is pretty simple, you can use easy_install or pip in your terminal run:
easy_install poster
or
pip install poster
If you do not have easy_install or pip, install the distribution kit first:
curl -O http://python-distribute.org/distribute_setup.py python distribute_setup.py
I recommend using pip and read some excellent documentation . You may also need to read the python documentation on module distribution .
In the future, look for pypi . If it is on pypi, you can run the pip or easy_install command.
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