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"IF NOT"

I'm trying to understand exactly what the code is asking?

x = 4 y= 2 if not 1 + 1 == y or x == 4 and 7 == 8: print("Yes") elif x > y: print("No")

I'm confused about what an "if" statement is asking of a Boolean.

The "`not`" part of this expression just inverts the result of the comparison "`1 + 1 == y`" so the entire thing means "if y is not equal to 2".
Everything after the "`or`" in the larger expression is meaningless since 7 will never equal 8.