How to use synthScope in Python?

  describe('MyConstruct', () => {
    let myconstruct: MyConstruct;
    const stack = Testing.synthScope(scope => {
      myconstruct = new MyConstruct(scope, "myconstruct");
    })
})

How does one write this in Python? there is always an error

E jsii.errors.JSIIError: Cannot pass function as argument here (did you mean to call this function?): <function TestingMyConstruct. at 0x1027a04a0>