字符串切片錯誤？

Question

我正在開發一個相當簡單的程序，將給定的非編碼DNA鏈轉換為它的所有對應鏈（編碼，mRNA，tRNA和氨基酸鏈）。

我在嘗試切片字符串時遇到了IndexError ：

mRNA_parts = mRNA.split(' ')
print mRNA_parts,  # using for debugging purposes

for base in mRNA_parts:
    print base # again, for debugging
    partA = base[0]
    partB = base[1]
    partC = base[2]
    my_acid = (amino_acids[partA][partB][partC]) + ' '
    # 'amino_acids' is a 3D (thrice-nested) dictionary with the corresponding parts of mRNA to convert to the amino acid chain.
    # part of the nested dictionary: amino_acids = {'U': {'U': {'U': 'Phe'}}}. This is only one part (out of 64) of it.
    # Thus, if  the mRNA section was 'UUU', the amino acid would be 'Phe '.
    acid_strand += my_acid

這是我得到的錯誤：

['GAU', '']
GAU


Traceback (most recent call last):
  File "D:\my_stuff\Google Drive\documents\SCHOOL\Programming\Python\DNA to RNA Converter.py", line 83, in <module>
    main()
  File "D:\my_stuff\Google Drive\documents\SCHOOL\Programming\Python\DNA to RNA Converter.py", line 3, in main
    convert(non_coding)
  File "D:\my_stuff\Google Drive\documents\SCHOOL\Programming\Python\DNA to RNA Converter.py", line 58, in convert
    partA = base[0]
IndexError: string index out of range

如果base為“ GAU”，base base[0]怎么做？

根據打印的內容，“ GAU”不是字符串嗎？ 它周圍沒有任何報價。

提前致謝！

Answer 1

它不是顯示GAU的錯誤，而是顯示空字符串'' ，您將其作為列表的第二個元素。 在循環開始時添加一個測試以忽略它。