How to change pycharm 5.0.1 cursor

By default in Mac any editor comes with insert mode like In PyCharm :

So we need to uninstall the VIM from Pycharm in this case

Preferences ---> Plugins ----> VIM (uninstall) and restart the py charm

Settings -> Editor -> General -> Appearance -> Use Block Caret

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It seems you have gone into overwrite mode.

Check what keyboard shortcut may be assigned to that in Preferences → Keymap → Editor Actions → Toggle Insert/Overwrite.
If it has no keyboard shortcut, or you can't be bothered to remember it, you can toggle it by pressing Command/Ctrl + Shift + A, type "overwrite" in the popup, which should bring up the "Toggle Insert/Overwrite" option, and hit enter.

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