The following works for me with PyCharm Community Edition 2018.1 on Xubuntu 16.04:
After loading the project (which was associated with the virtual environment that I wanted to update), I opened the PyCharm terminal window ( Alt F12 or View> Tool Windows> Terminal) and then used the command
pip install git+https://github.com/v-chojas/pyodbc@unicodecolumnsize
install pyodbc from the "unicodecolumnsize" branch of the v-chojas user v-chojas .
After the installation was completed, the package was found in the widow of the translator of the project.
On OSX + PyCharm 2018.1, you must restart PyCharm in order to receive the changes and recognize the import from the newly installed packages.

Gord thompson
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