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Converting Code Sets Using a Dictionary

If your code sets are large, you can use a dictionary to map one set of codes to another. A dictionary is easier to update than a complicated conditional statement.

The following example uses a dictionary to map locations to location codes:

locationtable = {
	'Toronto':  '011',
	'New York': '023',
	'London':   '030',
	'Paris':    '041',
	'Moscow':   '055',
	'Beijing':  '062',
}

if location in locationtable:
	locationid = locationtable[location]
else:
	# use '000' to represent an unknown location
	locationid = '000'

To add a new location, all you need to do is add a new key-value pair to the dictionary:

locationtable = {
	'Toronto':  '011',
	'New York': '023',
	'London':   '030',
	'Paris':    '041',
	'Moscow':   '055',
	'Beijing':  '062',
	'Tokyo':    '087',
}

For more information on dictionaries, see the section on Dictionaries.

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