Find all and only image files for specific filter

[mateuszpawlik]

I'd like to find all image files and only image files for, for example, bold suffix. The following query returns json and image files:

layout.get(scope='raw',suffix='bold')

How to get only image files in the output of get without constraining the file extensions? There are nice classes BIDSJSONFile and BIDSImageFile but I haven't found a way to use them as filters in get.

As a side note, the documentation is rather scarce in that matter and outdated (version 0.11.1 is online). The filters are not really explained.

[effigies]

I would use:

layout.get(scope='raw',suffix='bold', extension=[".nii", ".nii.gz"])

And yes, we do need to fix our docs. Thanks for reminding me. I'll rebuild and push manually for now...

[mateuszpawlik]

Thank you, my current solution also used the extension but with a regex.

Now, if I'd like to use BIDSImageFile.get_image(), I have to make sure that I have an image file. I can do this by using the extension in the filter (as you propose) or I found the BIDSFile.class_. Is the class_ attribute meant for such a use case?

[effigies]

Generally if I find something that begins or ends with _, I would expect that to be a private variable that should not be relied upon by outside tools.

I think isinstance(x, BIDSImageFile) or hasattr(x, "get_image") are going to be the more standard Python ways of checking your object types.

[mateuszpawlik]

I wanted to avoid type checking but you're right. Thank you.