Current dspec.read() for OVRO-LWA beamforming raw data requires the input to be a list.

[binchensun]

This is the relevant line -

suncasa-src/suncasa/dspec/dspec.py

Line 354 in 3886715

elif source.lower() == 'lwa' and type(fname) is list:

As a result, when I supply the input as a string (file name), it does nothing. Example code on pipeline:
d.read('/nas7a/beam/beam-data/202504/beam20250421/060786_1612000000005159ee4', source='lwa')

If I change it to a list, it is okay:
d.read(['/nas7a/beam/beam-data/202504/beam20250421/060786_1612000000005159ee4'], source='lwa', timerange=['2025-04-21T16:14', '2025-04-21T16:19'])

We should make this more flexible and allow it to take the input as both a string and a list. dspec.sources.lwa.read_data() already has this feature (https://github.com/suncasa/suncasa-src/blob/master/suncasa/dspec/sources/lwa.py). Potentially add an if/else block to https://github.com/suncasa/suncasa-src/blob/38867155ad29d41d935b0afe5f2069beaa1d7e13/suncasa/dspec/dspec.py#L327C1-L337C46? @peijin94 @sageyu123