Dumb noob q: ASCII value of a character

[Steve Horsley]

How can I get the ASCII value of a character, e.g. I have:

str = "A B"
for index in range(0, len(str)):
    value = WHAT_GOES_HERE?(str[index])
    print value


and I hope to get:
65
32
66


I know the characters will be printable ASCII. 
But how do I get those ASCII character values from the characters???
I can't seem to find it in the library reference

Thanks,
Steve