Python - DNA

### Warning: PYTHON 2 ###

dna_codons = { ## use lists ###
    'I': ['ATT', 'ATC', 'ATA'],
    'L': ['CTT', 'CTC', 'CTA', 'CTG', 'TTA', 'TTG'],
    'V': ['GTT', 'GTC', 'GTA', 'GTG'],
    'F': ['TTT', 'TTC'],
    'M': ['ATG'],
}

def translate(sequence):
    n = 3
    MyList = [sequence[i:i+n] for i in range(0, len(sequence), n)]
    for codon in MyList:
        for key, values in dna_codons.items(): # get key and values (not only key)
            if codon in values: # check item in list
                print key, # comma removes "\n" so it prints in one line
    print # go to new line after last key

#data = raw_input('type in DNA sequence: ')
data = "ATTGHIATGTTTTTCTYU"
translate(data)