You can't; there are no Cyrillic characters in ASCII. The chart you've shown is for one of the many "extended ASCII" character sets; specifically, it appears to be Windows-1251 (a.k.a. CP1251). In order to get a character's codepoint in this encoding, you thus need to first encode the string as CP1251 and then take the value of the resulting byte:
# Assuming Python 3
s = "Йог".encode('cp1251')
for b in s:
print(b)