I have installed PySide and NLTK via PIP. Both PySide and NLTK work well.
The code completion in PyCharm works for PySide well. The code completion works for NLTK objects, but it offered no NLTK methods. It shows only private methods like "_update", "__dir__", "__doc__", "__str__" with underscores.
In the Python 3.4.0 Shell IDLE works code completion for NLTK well.
Windows 7 64 Bit
PyCharm 3.4.1 Pro