diamantcode

def canonisch(codon):
    codon2 = codon[::-1]
    if codon[1] == "T":
        codon1 = codon[0] + "A" + codon[2]
    elif codon[1] == "A":
        codon1 = codon[0] + "T" + codon[2]
    elif codon[1] == "C":
        codon1 = codon[0] + "G" + codon[2]
    elif codon[1] == "G":
        codon1 = codon[0] + "C" + codon[2]
    codon3 = codon1[::-1]

    L = [codon,codon1,codon2,codon3]
    L.sort()
    return L[0]

def codon2aa(codon):
    #stap1
    c = canonisch(codon)

    #stap2
    n = c.replace("G","0").replace("T","1").replace("C","2").replace("A","3")
    w1 = n[0]
    w2 = n[1]
    w3 = n[2]
    p = (int(w1) + 4 * int(w2) + 16 * int(w3)) % 25

    #stap3
    alfabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    return alfabet[p]

def dna2eiwit(DNA):
    # codon bepalen
    str=""
    l = int(len(DNA))
    for i in range(0,l- 2):
        codon = DNA[i:i + 3]
        letter = codon2aa(codon)
        str += letter
    return str