| Shape = TypeVarTuple('Shape') | |
| Batch = NewType('Batch', int) | |
| Channels = NewType('Channels', int) | |
| def add_batch_axis(x: Array[*Shape]) -> Array[Batch, *Shape]: ... | |
| def del_batch_axis(x: Array[Batch, *Shape]) -> Array[*Shape]: ... | |
| def add_batch_channels( | |
| x: Array[*Shape] | |
| ) -> Array[Batch, *Shape, Channels]: ... | |
| a: Array[Height, Width] | |
| b = add_batch_axis(a) # Inferred type is Array[Batch, Height, Width] | |
| c = del_batch_axis(b) # Array[Height, Width] | |
| d = add_batch_channels(a) # Array[Batch, Height, Width, Channels] | |