[Tutor] referencing a dictionary

[brian callahan]

hi,

hows it going.  i had a quick (hopefully) question about using a dictionary. 
  my idea is to use a raw_input string, to search a dictionary that contains 
all the characters in the raw_input string with a value, and then i want to 
sum the values.  my script is used to take a the amino acid sequence of a 
protein and then give back the molecular weight.  i've been using the 
'learning python' book but im getting impatient.

thanks for your help,

brian c.
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