Fix problem with squared brackets in PyCharm
It seems some users cannot type squared brackets
 in PyCharm. This has worked for me (with PyCharm closed, of course):
- Navigate to PyCharm.app > Show Package Contents > Contents > bin.
- Add this new line at the end
actionSystem.force.alt.gr=trueand save the file.
After reopening PyCharm again, lovely squared brackets
 work as expected :)