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Comments on The Camelot Wheel

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The Camelot Wheel

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Given a musical key, output its number and letter on the Camelot Wheel (shown below).

Camelot Wheel

Input

A musical key as a string, as shown on the wheel. The words "Sharp" and "Flat" may be replaced with symbols (such as "#" and "b") if you wish.

Output

The number and letter, either as a string, tuple, or array.

Examples:

Input->Output
"E Major" -> "12B"
"F-Sharp Minor" -> "11A"
"Bb Minor" -> "3A"

This is code-golf.

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General comments (2 comments)
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Python 3, 101, 98, 94 bytes

First answer!

lambda s:f"{(('FCGDAEB'.index(s[0])-~-ord(s[5])*('-'in s)-3*('i'in s)-6)%12)+1}"+'BA'['i'in s]

Try it online!

Readable version:

def f(s):
 n="FCGDAEB".index(s[0])-6
 if '-' in s:
  n -= ord(s[5]-1)
 if 'i' in s:
  n -= 3

 return f"{(n%12)+1}"+'BA'['i'in s]

Python 3.9, 95, 91 bytes:

lambda s:f"{(('FCGDAEB'.index(s[0])-~-ord(s[5])*('-'in s)-3*(m:='i'in s)-6)%12)+1}"+'BA'[m]

Isn't the walrus operator great?

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General comments (1 comment)
General comments
Quintec‭ wrote about 3 years ago

+1 for the walrus operator