Python print() error msg

Scripting
,
1

For what reason does print(d) give an error message?

def f(x, y):
    return (x**2 + y**2 if x < 0 else
            2*x**2 - y**2 + x*y if 0 <= x < 1 else
            x**2 + 2*y**2 -x + y 
            )
    

a = {f(x == 1, y == 2) for x in range(-10, 10) for y in range(5)}
d = {f(x == 1, y == 2)}
c = {f(x = 1, y = 2)}

print(a)
print(d)
print(c)
2

d doesn’t exist.

3

True. Mathematically, it’s wrong.

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