definitiva.py

characters = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U',
              'V', 'W', 'X', 'Y', 'Z']
nletters = len(characters)
ndigits = 6

def prires(letters, x):
    ret = ""
    for l in letters:
        ret = ret + characters[l]
    if x > 0:
        ret = str(x) + ret
    padding = "0" * (6 - len(ret))
    return padding + ret

def matricula(x):
    for i in range (ndigits+1):
        h = ndigits - i
        top = 10**h*nletters**i
        xt = x - top
        
        if(xt < 0):
            letter = int(x / 10 ** (h))
            letters = [0] * i
            
            for j in range(i):
                letters[j] = int(letter / (nletters ** (i-j-1))) % nletters
                print(letters[j])
            return prires(letters, x % 10**h)
        x = xt
    
    return str(x)


numbers = [
    10**6*nletters**0  -1,
    10**6*nletters**0,
    10**6*nletters**0 +1,
    10**6*nletters**0 + 10**5*nletters**1 -1,
    10**6*nletters**0 + 10**5*nletters**1,
    10**6*nletters**0 + 10**5*nletters**1 +1,
    10**6*nletters**0 + 10**5*nletters**1 + 10**4*nletters**2 -1,
    10**6*nletters**0 + 10**5*nletters**1 + 10**4*nletters**2,
    10**6*nletters**0 + 10**5*nletters**1 + 10**4*nletters**2 +1,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3 - 1,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3 + 1,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3 + 10 ** 2 * nletters ** 4 - 1,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3 + 10 ** 2 * nletters ** 4,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3 + 10 ** 2 * nletters ** 4 + 1,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3 + 10 ** 2 * nletters ** 4 + 10 ** 1 * nletters ** 5 - 1,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3 + 10 ** 2 * nletters ** 4 + 10 ** 1 * nletters ** 5,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3 + 10 ** 2 * nletters ** 4 + 10 ** 1 * nletters ** 5 + 1,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3 + 10 ** 2 * nletters ** 4 + 10 ** 1 * nletters ** 5 + 10 ** 0 * nletters ** 6 - 1,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3 + 10 ** 2 * nletters ** 4 + 10 ** 1 * nletters ** 5 + 10 ** 0 * nletters ** 6,
    10 ** 6 * nletters ** 0 + 10 ** 5 * nletters ** 1 + 10 ** 4 * nletters ** 2 + 10 ** 3 * nletters ** 3 + 10 ** 2 * nletters ** 4 + 10 ** 1 * nletters ** 5 + 10 ** 0 * nletters ** 6 + 1,
]
for number in numbers:
    print(str(number) + ": " + matricula(number))