Agreed. Just as a for-instance: In Python 2, the parenthesis on a print call are optional. In Python 3, they're not. Going from 3 to 2 you probably won't even n

Agreed. Just as a for-instance: In Python 2, the parenthesis on a print call are optional. In Python 3, they're not. Going from 3 to 2 you probably won't even notice. Going from 2 to 3... To this day I often fail to type those parenthesis.