select.poll() compatibility with cpython

[pavelrevak]

Hello, I see one difference between cpython and micropython implementation of select.poll(), where:

• cpython uses fileno - integer - (filedescriptor),
• micropython uses socket like objects

cpython accepts for register and unregister also objects, but this object must have method fileno()
but poll.poll() returns always fileno

my question is how to write compatible code? I have these ideas:

1. stay with inefficient select
2. compare socket first then fileno, or check if returned is integer - it is always ugly

or do you have any other compatible but not ugly idea?

what is the reason for this difference?

thanks

[jimmo]

what is the reason for this difference?

@pavelrevak MicroPython doesn't have file numbers / file descriptors (except on the unix port, and then only for things that are actually unix files. See #12138 for some recent history here)

my question is how to write compatible code?

Yeah, this is an annoying difference. Honestly I'd probably just use select. But yes your suggestion of checking if the return type is int and mapping the fd back to the object is reasonable.