modify_request.py

import sys
sys.path.append('/afs/cern.ch/cms/PPD/PdmV/tools/McM/')
from rest import McM

mcm = McM(dev=True)

# Example to edit a request parameter(-s) and save it back in McM
# request_prepid_to_update = 'HIG-Summer12-01257' # Doesn't exist
request_prepid_to_update = 'HIG-Summer12-02358'
field_to_update = 'time_event'

# get a the dictionnary of a request
request = mcm.get('requests', request_prepid_to_update)

if 'prepid' not in request:
    # In case the request doesn't exist, there is nothing to update
    print('Request "%s" doesn\'t exist' % (request_prepid_to_update))
else:
    print('Request\'s "%s" field "%s" BEFORE update: %s' % (request_prepid_to_update,
                                                            field_to_update,
                                                            request[field_to_update]))

    # Modify what we want
    # time_event is a list for each sequence step
    request[field_to_update] = [10]

    # Push it back to McM
    update_response = mcm.update('requests', request)
    print('Update response: %s' % (update_response))

    # Fetch the request again, after the update, to check whether value actually changed
    request2 = mcm.get('requests', request_prepid_to_update)
    print('Request\'s "%s" field "%s" AFTER update: %s' % (request_prepid_to_update,
                                                           field_to_update,
                                                           request2[field_to_update]))