Check your call of comp_cl.string(). Did you correctly specify the first argument passed as a variable length argument?

I apologize for the mistake. Here's the corrected code: # Create a comparison object comp_cl = recordlinkage.Compare() # Find exact matches on city, cuisine_types comp_cl.exact('city', 'city', label='city') comp_cl.exact('cuisine_type', 'cuisine_type', label = 'cuisine_type') # Find similar matches of rest_name comp_cl.string('name', 'name', label='name', threshold = 0.8)