Why does the flush keyword not work with print()?

[Simpler1]

I am printing a string immediately before going into lightsleep, but the string doesn't complete until the sleep command is complete. The "flush" keyword on the print command should alleviate this, but it doesn't seem to work.

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print('x', flush=True)

produces

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File "<stdin>", line 1, in <module>
TypeError: extra keyword arguments given

yet, the definition of print shows that flush is a valid keyword:

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def print(
        *values: object, sep: Optional[Text] = ..., end: Optional[Text] = ..., file: Optional[_Writer] = ..., flush: bool = ...
    ) -> None: ...

[jimmo]

The "flush" keyword on the print command should alleviate this, but it doesn't seem to work.

Unfortunately MicroPython doesn't support the flush kwarg on print.

This does sound like a useful feature in this particular case though... I'm not sure if there's a workaround. Are you writing to a UART or a USB VCP?

yet, the definition of print shows that flush is a valid keyword:

This definition comes from (I'm guessing) CPython.

[Simpler1]

Hi jimmo,

I was just creating some code to test the lightsleep and deepsleep modes on the ESP32-CAM when I noticed this limitation.

I was just surprised that flush didn't work with print.