'''
    Purpose: introduction to dictionary'
'''

mappings = {}           # dictionaries are defined using {} (curly braces)
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'
# Adding a mapping to a dictionary:
    # dictionary_name[key] = value
    # ex. mappings[0] = 'even'
    # So our dictionary looks like { 0: 'even', 1: 'odd', ...} where ... are the other mappings

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

# Getting values in our dictionary at keys (in this example, the key is n)

# status = mappings[ n ] # Getting the value for a key (dictionaryname[key] will give you the value at the key)
                        # Will give you the value if the key exists in our dictionary (mappings[3] will give you 'odd')
                        # Will give you an error if the key doesn't exist in our dictionary (ex.mappings[14] will give you an error)

status = mappings.get( n ) # Getting the value for a key (dictionaryname.get( key ) will give you the value at that key)
                          # Will give you the value if the key exists (mappings.get(3) will give you 'odd')
                          # Will give you None if the key doesn't exist in our dictionary (mappings.get(14) will give you None)

print( n, status )

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

meaning = mappings[ reply ]

print( meaning )