TypeError: MySensor: No constructor defined!

[JiangGuotai]

I wanna define a sensor class using template in python, but when I use the code:

class MySensor(mi.ProjectiveCamera):
    def __init__(self, props):
        mi.ProjectiveCamera.__init__(self, props)

there will be a error: No constructor defined!

I can only use

class MySensor(mi.Sensor):
    def __init__(self, props):
        mi.Sensor.__init__(self, props)

but in C++, ProjectiveCamera is used as a parent class, so... what can i do to use ProjectiveCamera as a parent class in python?

[njroussel]

The reason why it only works with mi.Sensor is that we only defined Python bindings on the top-level base classes for every plugin. This is done in src/render/python/sensor_v.cpp, we define a pybind11 trampoline (more information).

If you wanted to define a Python class which derives from ProjcetiveCamera. I believe you would need to add a similar trampoline to the existing one for Sensor but for ProjectiveCamera.
Another approach would be to re-implement the ProjectiveCamera in Python, and then have your new Sensor inherit from that one instead.

[JiangGuotai]

ok, I am trying to re-implement the ProjectiveCamera, thank you for the reply.