What is difference between plpython, plpythonu, plpython2u

what is difference between plpython, plpythonu, plpython2u.

What does u and 2u mean.

Looking around I could't find any info on that matter.


The PL/Python procedural language allows PostgreSQL functions to be written in the Python language. PL/Python2U untrusted procedural language

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NSShadow set() method in iOS

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In Apple's documentation for NSShadow in UIKit, they state:

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