mRNA翻译成蛋白

 dna = "ATGCACGTGCGCTCACTGCGAGCTGCGGCGCCGCACAGCTTCGTGGCGCTCTGGGCACCCCTGTTCCTGCTGCGCTCCGCCCTGGCCGACTTCAGCCTGGACAACGAGGTGCACTCGAGCTTCATCCACCGGCGCCTCCGCAGCCAGGAGCGGCGGGAGATGCAGCGCGAGATCCTCTCCATTTTGGGCTTGCCCCACCGCCCGCGCCCGCACCTCCAGGGCAAGCACAACTCGGCACCCATGTTCATGCTGGACCTGTACAACGCCATGGCGGTGGAGGAGGGCGGCGGGCCCGGCGGCCAGGGCTTCTCCTACCCCTACAAGGCCGTCTTCAGTACCCAGGGCCCCCCTCTGGCCAGCCTGCAAGATAGCCATTTCCTCACCGACGCCGACATGGTCATGAGCTTCGTCAACCTCGTGGAACATGACAAGGAATTCTTCCACCCACGCTACCACCATCGAGAGTTCCGGTTTGATCTTTCCAAGATCCCAGAAGGGGAAGCTGTCACGGCAGCCGAATTCCGGATCTACAAGGACTACATCCGGGAACGCTTCGACAATGAGACGTTCCGGATCAGCGTTTATCAGGTGCTCCAGGAGCACTTGGGCAGGGAATCGGATCTCTTCCTGCTCGACAGCCGTACCCTCTGGGCCTCGGAGGAGGGCTGGCTGGTGTTTGACATCACAGCCACCAGCAACCACTGGGTGGTCAATCCGCGGCACAACCTGGGCCTGCAGCTCTCGGTGGAGACGCTGGATGGGCAGAGCATCAACCCCAAGTTGGCGGGCCTGATTGGGCGGCACGGGCCCCAGAACAAGCAGCCCTTCATGGTGGCTTTCTTCAAGGCCACGGAGGTCCACTTCCGCAGCATCCGGTCCACGGGGAGCAAACAGCGCAGCCAGAACCGCTCCAAGACGCCCAAGAACCAGGAAGCCCTGCGGATGGCCAACGTGGCAGAGAACAGCAGCAGCGACCAGAGGCAGGCCTGTAAGAAGCACGAGCTGTATGTCAGCTTCCGAGACCTGGGCTGGCAGGACTGGATCATCGCGCCTGAAGGCTACGCCGCCTACTACTGTGAGGGGGAGTGTGCCTTCCCTCTGAACTCCTACATGAACGCCACCAACCACGCCATCGTGCAGACGCTGGTCCACTTCATCAACCCGGAAACGGTGCCCAAGCCCTGCTGTGCGCCCACGCAGCTCAATGCCATCTCCGTCCTCTACTTCGATGACAGCTCCAACGTCATCCTGAAGAAATACAGAAACATGGTGGTCCGGGCCTGTGGCTGCCACTAG"

 def trabslate_dna(sequence):

     start_codon = 'ATG'

     stop_codon = ('TAA', 'TAG', 'TGA' )

     codontable = {

         'ATA': 'I', 'ATC': 'I', 'ATT': 'I', 'ATG': 'M',

         'ACA': 'T', 'ACC': 'T', 'ACG': 'T', 'ACT': 'T',

         'AAC': 'N', 'AAT': 'N', 'AAA': 'K', 'AAG': 'K',

         'AGC': 'S', 'AGT': 'S', 'AGA': 'R', 'AGG': 'R',

         'CTA': 'L', 'CTC': 'L', 'CTG': 'L', 'CTT': 'L',

         'CCA': 'P', 'CCC': 'P', 'CCG': 'P', 'CCT': 'P',

         'CAC': 'H', 'CAT': 'H', 'CAA': 'Q', 'CAG': 'Q',

         'CGA': 'R', 'CGC': 'R', 'CGG': 'R', 'CGT': 'R',

         'GTA': 'V', 'GTC': 'V', 'GTG': 'V', 'GTT': 'V',

         'GCA': 'A', 'GCC': 'A', 'GCG': 'A', 'GCT': 'A',

         'GAC': 'D', 'GAT': 'D', 'GAA': 'E', 'GAG': 'E',

         'GGA': 'G', 'GGC': 'G', 'GGG': 'G', 'GGT': 'G',

         'TCA': 'S', 'TCC': 'S', 'TCG': 'S', 'TCT': 'S',

         'TTC': 'F', 'TTT': 'F', 'TTA': 'L', 'TTG': 'L',

         'TAC': 'Y', 'TAT': 'Y', 'TAA': '_', 'TAG': '_',

         'TGC': 'C', 'TGT': 'C', 'TGA': '_', 'TGG': 'W'

     }

     start = sequence.find(start_codon)

     codons = [] # Create a codon list to store codons generated from coding seq.

     for i in range(start, len(sequence), ):

         if sequence[i:i+] in stop_codons:

             break

         if sequence[i:i+] in codontable.keys():

             codons.append(sequence[i:i+])

     protein_sequence = ''.join([codontable[codon] for codon in codons]) #Translate condons to protein seq.

     return "{0}_".format(protein_sequence)

 protein_seq = translate_DNA(dna)

 print(protein_seq)