flip keys and values in dictionary python

Question

I have a dictionary called z that looks like this

---

{0: [0.28209479177387814, 0.19947114020071635, 0.10377687435514868, 0.07338133158686996], -1: [0.282094791773878

Answer 1

Easiest way to flip key value in a dict is using dict comprehension, which looks like this: {value: key for key, value in ORIGINAL_DICT.items()}. Full example:

REGION_PREFIX = {
    'AB': 'Alberta',
    'BC': 'British Columbia',
    'IN': 'International',
    'MB': 'Manitoba',
    'NB': 'New Brunswick',
    'NL': 'Newfoundland',
    'NS': 'Nova Scotia',
    'NU': 'Nunavut',
    'NW': 'Northwest Territories',
    'ON': 'Ontario',
    'PE': 'Prince Edward Island',
    'QC': 'Quebec',
    'SK': 'Saskatchewan',
    'US': 'United States',
    'YK': 'Yukon',
}

REGION_PREFIX2 = {value: key for key, value in REGION_PREFIX.items()}

And your output is this:

{'Alberta': 'AB', 'British Columbia': 'BC', 'International': 'IN', 'Manitoba': 'MB', 'New Brunswick': 'NB', 'Newfoundland': 'NL', 'Nova Scotia': 'NS', 'Nunavut': 'NU', 'Northwest Territories': 'NW', 'Ontario': 'ON', 'Prince Edward Island': 'PE', 'Quebec': 'QC', 'Saskatchewan': 'SK', 'United States': 'US', 'Yukon': 'YK'}

Cheers!