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Python metaprogramming example
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class Meta(type): | |
def __new__(cls, what, bases=None, dict=None): | |
if 'area' not in dict: | |
raise Exception("Area not found!") | |
return type.__new__(cls, what, bases, dict) | |
class Shape(metaclass=Meta): | |
def __init__(self, l, w): | |
self.l = l | |
self.w = w | |
def area(self): | |
return self.l * self.w | |
class Square(Shape): | |
def __str__(self): | |
return f"[Square] Width: {self.w}, Length: {self.l} Area: {self.area()}" | |
def area(self): | |
return super().area() | |
class Triangle(Shape): | |
def __str__(self): | |
return f"[Triangle]: Width: {self.w}, Length: {self.l}, Area: {self.area()}" | |
def area(self): | |
return (self.l * self.w) // 2 | |
def main(): | |
print(Square(2, 2)) | |
print(Triangle(2, 3)) | |
if __name__ == '__main__': | |
main() |
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