访问列表中元组中元组中的值[错误]

Question

我正在使用一个名为ANARCI的工具对抗体序列进行编号，程序的输出如下所示：

[((1, ' '), 'E'), ((2, ' '), 'V'), ..., ((113, ' '), 'A')]

我试图将编号保存在.csv文件中，但在访问上面简短部分中显示的空字符串时遇到问题。其中一些会有一个字母，我需要检查字符串是否为空。这是我为此编写的代码：

with open(fileName + '.csv', 'wb') as myFile:
    # sets wr to writer function in csv module
    wr = csv.writer(myFile, quoting=csv.QUOTE_ALL)
    # writes in headers
    wr.writerow(headers)
    # iterates through numbering
    for row in numbering:
        # gets to the innermost tuple
        for tup in row:
            # checks if the string contains a letter
            if tup[1] != ' ':
                # makes the number and letter a single string
                numScheme = str(tup[0])+str(tup[1])
                # creates a list of values to write
                varList = [baNumbering,numScheme,row[1]]
                wr.writerow(varList)
            else:
                # if the string does not contain a letter, the list of values is created without the string
                varList = [baNumbering,tup[0],row[1]]
                wr.writerow(varList)
        baNumbering = baNumbering + 1

我的想法是for row in numbering:将我带到包含元组的元组，for tup in row:将允许我检查最里面元组的索引。我想让varList成为一个包含数字的列表，编号（可能带有字母），然后是字母——比如：["1","1","E"]或["30","29B","Q"]。但是，我得到了一个错误：

Traceback (most recent call last):
  File "NumberingScript.py", line 101, in <module>
    Control()
  File "NumberingScript.py", line 94, in Control
    Num()
  File "NumberingScript.py", line 86, in Num
    SaveNumbering(numbering,numberingScheme)
  File "NumberingScript.py", line 72, in SaveNumbering
    WriteFile(numbering,numberingScheme,fileName)
  File "NumberingScript.py", line 51, in WriteFile
    if tup[1] != ' ':
IndexError: string index out of range

有没有更好的方法访问元组中的字符串？我所能找到的所有资源都只包含一个元组列表，并且没有提到如何处理这里的内容。你知道吗

Answer 1

当tup获取“E”值并且您试图获取一个不存在的索引时，会引发异常。你知道吗

for row in numbering:
            for tup in row:
                if tup[1] != ' ':  # Raised exception  > 'E'[1]

如果我正确理解你的目标，试着用这个：

DATA = [((1, ' '), 'E'), ((2, ' '), 'V'), ((113, ' '), 'A')]

def get_tuples(data):
    for item in data:
        for element in item:
            if isinstance(element, tuple):
                yield element
            else:
                continue

for tup in get_tuples(DATA):
    print(tup)

输出

(1, ' ')
(2, ' ')
(113, ' ')