Pipe character in Python

Question

I see a "pipe" character (|) used in a function call:

res = c1.create(go, come, swim, "", startTime, endTime, "OK", ax|bx)

What is the meaning of the pipe in ax|bx?

Answer 1

This is also the union set operator

set([1,2]) | set([2,3])

This will result in set([1, 2, 3])