Catch multiple exceptions with one statement #21

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lriesebos · 2021-07-13T02:40:02+08:00

lriesebos commented

2021-07-13 02:40:02 +08:00

Currently it is not possible to catch multiple exceptions with one except statement. Not sure if this should be resolved in the current compiler too, but it would be pleasant to have this at least in NAC3.

The following program

from artiq.experiment import *

class ArtiqTestExperiment(EnvExperiment):

    def build(self):
        self.setattr_device('core')

    @kernel
    def run(self):
        try:
            self.core.reset()
        except (RTIOUnderflow, ValueError):
            pass

return this compile error:

repository/artiq_test.py:13:16-13:43: error: this expression must refer to an exception constructor
        except (RTIOUnderflow, ValueError):
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^

Currently it is not possible to catch multiple exceptions with one `except` statement. Not sure if this should be resolved in the current compiler too, but it would be pleasant to have this at least in NAC3. The following program ```python from artiq.experiment import * class ArtiqTestExperiment(EnvExperiment): def build(self): self.setattr_device('core') @kernel def run(self): try: self.core.reset() except (RTIOUnderflow, ValueError): pass ``` return this compile error: ``` repository/artiq_test.py:13:16-13:43: error: this expression must refer to an exception constructor except (RTIOUnderflow, ValueError): ^^^^^^^^^^^^^^^^^^^^^^^^^^^ ```

pca006132 commented

2021-07-14 13:04:29 +08:00

Yes, this should not be too hard. I think we can also resolve this in the current compiler too if needed, I can look into it later when I have time.

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Reference: M-Labs/nac3-spec#21