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i dont understand how the add function is picking x of other cause i thinking it should be picking another arrtibute of first on

class Vector2D: def __init__(self, x, y): self.x = x self.y = y def __add__(self, other): return Vector2D(self.x + other.x, self.y + other.y) first = Vector2D(5, 7) second = Vector2D(3, 9) result = first + second print(result.x) print(result.y) //output-8 16

3rd May 2020, 8:59 AM
Gaurav Gupta
Gaurav Gupta - avatar
2 Respuestas
+ 2
When you do.... result = first + second ...what your actually doing is... result = first.__add__(second)...the "second" is the "other" in the magic method.
3rd May 2020, 11:17 AM
rodwynnejones
rodwynnejones - avatar
+ 1
+ is defined as doing what's defined in __add__, returning a new Vector with the x values and the y values added. In this program, first will be self, second will be other. 5+3 == 8 7+9 == 16 Is it getting clearer like this?
3rd May 2020, 9:07 AM
HonFu
HonFu - avatar