'Opening multiple resources (Python)

I am trying to use:

rm.open_resource('ASRL7::INSTR')

But I need to open multiple resources and need them to stay open simultaneously. For my functions that apply to these resources I am using threading to operate them simultaneously. But every time I run my code, I see the error:

pyvisa.errors.InvalidSession: Invalid session handle. The resource might be closed.

Is there a way I can keep both resources open?



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