Efficient_Practices | Python Fiddle

## COMPARISON OF 2 WAYS TO LOOP TO ASSIGN VALUES BASED ON CONDITIONS
## Imagine we have are looping through rows in an attribute table, or a similar task.
## In this example, since we don't have an attribute table, imagine that we already have field
## values stored in a list.

## INEFFICIENT WAY

towns = ['Banff', 'Canmore', 'Calgary', 'Chestermere', 'Airdrie', 'Edmonton', 'Montreal', 'Madrid', 'Barcelona', 'London', 'Rabat']

for town in towns:
    
    if town in ('Madrid', 'Barcelona'):
        print 'Hey, %s is in Spain!' % town
    
    elif town == 'London':
        print 'Hey, %s is in UK!' % town
        
    elif town == 'Rabat':
        print 'Hey, %s is in Morocco!' % town
       
    else:
        print 'Hey, %s is in Canada!' % town

print '\n-------------------------------------------------------------------------------\n'
## EFFICIENT WAY

ctrs_cds = {'cn':'Canada', 'sp':'Spain','uk':'UK','mr':'Morocco'}

dict_towns_countries = {'Banff': ctrs_cds['cn'], 'Canmore': ctrs_cds['cn'], 'Calgary': ctrs_cds['cn'],
                        'Chestermere': ctrs_cds['cn'], 'Airdrie': ctrs_cds['cn'], 'Edmonton': ctrs_cds['cn'],
                        'Montreal': ctrs_cds['cn'], 'Madrid':ctrs_cds['sp'], 'Barcelona':ctrs_cds['sp'],
                        'London':ctrs_cds['uk'], 'Rabat':ctrs_cds['mr']}

for key in dict_towns_countries:
    print 'Oh, yes, %s is in %s' % (key, dict_towns_countries[key])

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