Example usage:
>>> python collect.py "j k rowling"
Author key: OL23919A
>>> python extract_themes.py ../data/OL23919A.json
>>> python collect.py "stephen king"
Author key: OL19981A
>>> python extract_themes.py ../data/OL19981A.json
>>> python compare_themes.py ../data/OL23919A_theme.json ../data/OL19981A_theme.json
Some subjects unique to author 1 (OL23919A):
Schools (institutions)
Poudlard (Organisation imaginaire)
Potter, Harry (Fictitious character)
Quête (Littérature)
Fantasy fiction, history and criticism
Some subjects unique to author 2 (OL19981A):
FICTION Horror
Future life
smoking cessation
American literature
interrogation
Some subjects both authors have in common:
Open Library Staff Picks
Fiction
Fiction, suspense
Large type books
Fantasy fiction