postal_code_checker

### Postal Code checker ###

letters = {'a': 'NL', 'b': 'NS', 'c': 'PEI', 'e': 'NB', 'ghj': 'QC',
           'klmnp': 'ON', 'r': 'MB', 's': 'SK', 't': 'AB', 'v': 'BC',
           'x': 'NU or NT', 'y': 'YT'}

def check_postal_code(postal_code, letter_dictionary):
    "All this will do is check if you have a valid postal code on your hands."

    postal_code = postal_code.lower()
    code_zero = False
    
    if postal_code[1] == '0':
        urban_or_rural = 'Rural '
        
    else:
        urban_or_rural = 'Urban '
        
    for key in letter_dictionary:
        if postal_code[0] in key:
            province = letter_dictionary[key]
            code_zero = True
            
    if code_zero == True:
        return urban_or_rural + province
        
    else:
        return 'Not a valid postal code.'