Python - !r

没有使用 !r:

class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y


    def __repr__(self):
        return f'Point({self.x}, {self.y})'

p = Point('1', '2')
print(repr(p))  # 输出：Point(1, 2)

p = Point(1, 2)
print(repr(p))  # 输出：Point(1, 2)

使用!r:

class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __repr__(self):
        return f'Point({self.x!r}, {self.y!r})'

p = Point('1', '2')
print(repr(p))  # 输出：Point('1', '2')

p = Point(1, 2)
print(repr(p))  # 输出：Point(1, 2)

!r是一种格式化字符串的方法，它的作用是将一个对象转换为其表示的字符串形式，并保留对象本身的表达方式。

https://geek-docs.com/python/python-ask-answer/67_python_what_does_r_do_in_str_and_repr.html