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

# 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 dictionary
commodity_mappings = url.get_dictionary( COMMODITIES_CSV )

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

still_looking_for_queries = ...

while ( still_looking_for_queries == True ) :
    # prompt for next query
    reply = input( "Enter commodity: " )

    # clean up response to
    query = ...

    # examine query -- there are three possibilities
    #   is empty => done looking for queries
    #   is in dictionary => process request
    #   is not in dictionary => flag that request is unknown.

    ...

# all done