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from functools import singledispatch


@singledispatch
def render(x):
    return "object:default"


@render.register
def _(x: int):
    return f"int:{x}"


@render.register
def _(x: str):
    return f"str:{x}"


@render.register
def _(x: list):
    return f"list[{len(x)}]"


print(render(42))
print(render("hi"))
print(render([1, 2, 3]))
print(render(True))
print(render(3.14))

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