Event type depends on time_interval_s

[miromarszal]

When applying hooks to read or modify events on the fly, the type passed to the function depends on time_interval_s. For any value other than zero, an event is a dict, whereas for time_interval_s=0 the entire list of events is passed to the function.

The code below

from pycromanager import Acquisition, multi_d_acquisition_events

def hook_fn(event):
    print(event)
    return event

with Acquisition(directory='./', post_hardware_hook_fn=hook_fn) as acq:
    events = multi_d_acquisition_events(
        num_time_points=5,
        time_interval_s=1,
        )
    acq.acquire(events)

produces

{'axes': {'time': 0}, 'min_start_time': 0}
{'axes': {'time': 1}, 'min_start_time': 1}
{'axes': {'time': 2}, 'min_start_time': 2}
{'axes': {'time': 3}, 'min_start_time': 3}
{'axes': {'time': 4}, 'min_start_time': 4}

which is what I would expect. However, changing to time_interval_s=0 results in

[{'axes': {'time': 0}}, {'axes': {'time': 1}}, {'axes': {'time': 2}}, {'axes': {'time': 3}}, {'axes': {'time': 4}}]

This leads to unexpected errors.

EDIT: I noticed now that it also happens for anything lower than time_interval_s=0.001.

[miromarszal]

Ok sorry for not reading the docs carefully enough... This is because of sequencing, which is used for short time delays.