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Re:Most popular Python packages now support Python 3 by gogoengie on Saturday December 02, 2017 @01:17PM (#15833166)
For many of the major scientific libraries, the goal is to deprecate Python 2.7 no later than 2020:

http://www.python3statement.org/

Re:Most popular Python packages now support Python 3 by dbcurtis on Saturday December 02, 2017 @02:20PM (#15833493)
Considering 2.7 is EOL in 2020, I'm thinking the default policy position of any serious library should be to deprecate 2.7 by 2020.