Prints the subject_id and experiment_id of XNAT experiments whose scans are all missing snapshots

nosnapshots.py

# prints the subject_id and experiment_id of XNAT experiments whose scans are all missing snapshots 
# used against XNAT 1.6.5 by python 2.7
import xnat # see https://xnat.readthedocs.io/en/latest/

url = raw_input("Enter XNAT url: ")
user = raw_input("Enter username: ")
session = xnat.connect(url, user=user)
name = raw_input("Enter project: ")
project = session.projects[name]

print 'subject, session'
for subject_id in project.subjects.keys():
    for experiment_id in project.subjects[subject_id].experiments.keys():
        has_snapshots = False
        for scan_id in project.subjects[subject_id].experiments[experiment_id].scans.keys():
            for resource_id in project.subjects[subject_id].experiments[experiment_id].scans[scan_id].resources.keys():
                resource = project.subjects[subject_id].experiments[experiment_id].scans[scan_id].resources[resource_id]
                if resource.label=='SNAPSHOTS' and len(resource.files)>0:
                    has_snapshots = True
                    break
            if has_snapshots:
                break
        if has_snapshots==False:
            print '{}, {}'.format(subject_id, experiment_id)