data
├── conferences
│   ├── html
│   └── txt
├── talks
│   ├── html
│   └── txt
└── words
    └── csv

# downloads into data/conferences/html/{Year}-{Month}
$ python conference-downloader.py

# extracts links into data/conferences/txt/{Year}-{Month}
$ python conference-parser.py

# downloads into data/talks/html/{Year}-{Month}/{file_name}
$ python talk-downloader.py

# extracts into data/talks/txt/{Year}-{Month}/{file_name}
$ python talk-parser.py
# writes

$ python sentiment.py
# outputs sentiment.csv