'''
    Purpose: introduction to dictionary'
'''
# mappings[ key ] = value              # CREATES A NEW MAPPING IN DICTIONARY
mappings = {}   # Initialize an empty dictionary
mappings[ 0 ] = 'even' 
mappings[ 1 ] = 'odd' 
mappings[ 2 ] = 'even' 
mappings[ 3 ] = 'odd' 
mappings[ 4 ] = 'even' 
mappings[ 5 ] = 'odd' 
mappings[ 6 ] = 'even' 
mappings[ 7 ] = 'odd' 
mappings[ 8 ] = 'even' 
mappings[ 9 ] = 'odd' 
mappings[ 'even' ] = 'a number is even if its remainder divided by 2 is 0'
mappings[ 'odd' ] = 'a number is odd if its remainder divided by 2 is 1'


reply = input( 'Enter a number: ' )
n = int( reply )

# These two ways get the value for a particular key.
# One is a function that returns None if the key doesn't exist - the other
# won't give you None.
# status = mappings[ n ] # GET THE DICTIONARY VALUE FOR THE KEY N
status = mappings.get( n )   # If key is not in dictionary, the mapping doesn't
                             # exist so .get() hands back None.
                        # The first way will not give you None it will just
                        # throw an error if you don't have the key in the dict.

print( n, status ) # PRINT THE NUMBER AND THE VALUE IN THE DICTIONARY FOR
                    # THAT NUMBER AS A KEY

reply = input( 'Enter even or odd: ' )

meaning = mappings[ reply ]

print( meaning )