Created
February 12, 2021 10:10
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| def alphaonly_ordinal(n): | |
| """ | |
| Use alphabets as ordinal symbols | |
| a = 1, b = 2, ..., z = 26, | |
| aa = 27, ab = 28, etc | |
| """ | |
| assert n > 0 | |
| s = '' | |
| while n: | |
| n -= 1 # 1-based to 0-based indexing | |
| n, r = divmod(n, 26) | |
| s += chr(97 + r) | |
| return s[::-1] |
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