The mentioned date is the end of support. Already deployed apps are not directly affected on an immediate time frame. On a longer term though, you'll have to migrate your code to Python 3 or delete it. The effort involved is not necessary enormous in each case, in a lot of cases this might take minutes. If you foresee, by contrast, considerable effort to migrate to Python 3, you should contact support and ask for specific help and possible transitional arrangements. Advice and custom-made tools should be expected, to alleviate the effort required by migration tasks. Most Python developers prefer Python 3, and there are considerable advantages in following suit.
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