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1-liner solution in Creative category for Roman Numerals by Stensen
checkio=lambda n: ['','M','MM','MMM'][n//1000]+['','C','CC','CCC','CD','D','DC','DCC','DCCC','CM'][n//100%10]+['','X','XX','XXX','XL','L','LX','LXX','LXXX','XC'][n//10%10]+['','I','II','III','IV','V','VI','VII','VIII','IX'][n%10]
Sept. 23, 2020
