def test_cannot_instantiate(self):
with self.assertRaises(TypeError):
Callable()
with self.assertRaises(TypeError):
type(Callable)()
c = Callable[[int], str]
with self.assertRaises(TypeError):
c()
with self.assertRaises(TypeError):
type(c)()
def make_matrix(
num_rows: int, num_cols: int, entry_fn: Callable([int, int],
float)) -> Matrix:
return [[entry_fn(i, j) for j in range(num_cols)] for i in range(num_lows)]
