You could loop over that input in steps of two, detect the binary word and add the corresponding nucleic acid to the output.
inputStr="00011011" # ABCD
outputStr=""
for start in range(0, len(inputStr), 2):
word = inputStr[start:start+2]
if word == '00': outputStr += 'A'
elif word == '01': outputStr += 'B'
elif word == '10': outputStr += 'C'
elif word == '11': outputStr += 'D'
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solved Converting binary code to DNA code [closed]