letters to numbers

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letters to numbers

 
0
  #1
Oct 18th, 2009
Is there a built-in function to give the value of a letter?

what I mean is
a=1
b=2
c=3
d=4
e=5
f=6
...

something like letval(a) would give me 1
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  #2
Oct 18th, 2009
You mean something like this ...
python Syntax (Toggle Plain Text) 
  1. def letval(x):
  2.     print(x)
  3.  
  4. a = 77
  5. letval(a)
  6.  
  7. # you can just use
  8. print(a)
Last edited by vegaseat; Oct 18th, 2009 at 3:18 pm.
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  #3
Oct 18th, 2009
No I don't mean that, that would be stupid.
every letter of the alphabet represents a number
a = the first letter = the first number = 1
b = the second letter = the second number = 2
...
so if I did:
python Syntax (Toggle Plain Text) 
  1. letval(a) #=1
  2. letval(g) #=7 because g is the seventh letter in the alphabet
Last edited by Kruptein; Oct 18th, 2009 at 3:27 pm.
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  #4
Oct 18th, 2009
hint: use ord("a") .
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  #5
Oct 18th, 2009
hm okay, but in that case I have to make a difference between caps and lowercase letters,... but I will work with that.
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  #6
Oct 18th, 2009
Convert them all to lower case before using ord:
Python Syntax (Toggle Plain Text) 
  1. l =  l.lower()
Last edited by scru; Oct 18th, 2009 at 5:07 pm.
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  #7
Oct 18th, 2009
If you are only interested in the letter's position in the alphabet, you can use something like this ...
python Syntax (Toggle Plain Text) 
  1. import string
  2.  
  3. def letter_position(letter):
  4.     ucase = string.uppercase
  5.     pos = ucase.find(letter.upper()) + 1
  6.     if pos:
  7.         print( "%s has position %d in the alphabet" % (letter, pos) )
  8.  
  9. letter_position('E')
  10. letter_position('f')
  11. letter_position('a')
  12. letter_position('Z')
  13. letter_position('8')  # a number gives no response
Last edited by vegaseat; Oct 18th, 2009 at 5:22 pm.
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  #8
Oct 19th, 2009
That's the one I needed! thanks
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