''' Purpose: demonstrate while loop and dict mappings
    Name:

    Email id: 
'''

# get url reading abilities
import url

# where is the commodity cost mappings
COMMODITIES_CSV = 'http://www.cs.virginia.edu/~cs1112/datasets/csv/commodities.csv'

# get web-based commodities dataset 
dataset = url.get_csv_dataset( COMMODITIES_CSV )

# convert dataset into commodity cost mappings dictionary
commodity_mappings = {}
...

# while user is supplying queries, process them. user indicates no more
# queries by not entering an empty response
...

# all done