The reasons are arbitrary and are post-hoc rationalizations about the latest technology and when an example is brought up about the IRS still running on assembly and cobol the young technologist creates the convoluted kernel to separate the IRS from their special use case. There is no good reason to upgrade a python 2.7 codebase to a 3.x codebase. If you think there is then you are probably fooling yourself because you are young and foolish.
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