为什么两个字符串之间的断言失败？

Question

我要和Stepic一起去上课。我认为两个字符串之间的一个简单断言失败了。不然我怎么才能检查平等呢？谢谢，吉姆

def weights_to_letters(peptide):
    '''
    take a list of weights and convert to a string of aa letters
    '''
    from Bio.Data.IUPACData import protein_weights
    ret_string = ''
    for weight in peptide:
        for key in protein_weights.keys():
            if weight == round(protein_weights[key] - 18):   # -18 for weight of extra water molecule
                ret_string += str(key)
                break
    return ret_string
def test_weights_to_letters():
    print(type('WDG') , 'WDG', type(weights_to_letters([186,128,113])),     weights_to_letters([186,115,57]))
    assert weights_to_letters([186,128,113]) == 'WDG'

这就是最后的结果：

<class 'str'> WDG <class 'str'> WDG
Traceback (most recent call last):
  File "C:\Users\Jim\My Documents\GitHub\Stepic-Rosalind\BioAlgWeek2.py", line 238, in <module>
testcode()
  File "C:\Users\Jim\My Documents\GitHub\Stepic-Rosalind\BioAlgWeek2.py", line 228, in testcode
   test_weights_to_letters()
 File "C:\Users\Jim\My Documents\GitHub\Stepic-Rosalind\BioAlgWeek2.py", line 209, in    test_weights_to_letters
assert weights_to_letters([186,128,113]) == 'WDG'
AssertionError

Answer 1

您似乎在test_weights_to_letters()的第一行中有一个错误。您正在向weights_to_letters传递186,115,57，但您正在断言weights_to_letters(186,128,113)。