> Python has changed incompatibly once in 26 years That's not true. Every change breaks some behavior, even if it's not throwing an Exception where one used to

> Python has changed incompatibly once in 26 years That's not true. Every change breaks some behavior, even if it's not throwing an Exception where one used to be thrown. Things are still being deprecated and removed in new releases. On top of that, by adding new syntax in 3.7+, libraries may become incompatible with the system-provided installation. That won't happen with 2.7 libraries.