text = 'AGCTGATCGC'
def melt_t(seq):
    base = ['A', 'T', 'C' 'G']
    seq = list(text)
    seq_added=''

    TomaszWpierdol=len(text)

    for base in seq:
        for A in text:
            resultA = seq.count('A')
        for T in text:
            resultT = seq.count('T')
        for C in text:
            resultC = seq.count('C')
        for G in text:
            resultG = seq.count('G')
    seq_added = (resultA + resultT)*2 + (resultC + resultG)*4


    if (TomaszWpierdol > 13):
        seq_added = (64.9+41*((resultG+resultC-16.4)/(resultA+resultT+resultG+resultC)))

    print('Melting Temperature is {}'.format(seq_added))
    return seq_added;
melt_t(text)