Python - 为匹配的行添加前缀和后缀

Question

我在 Python 中有一些引擎，它读取目录中的 .txt 文件，隔离以特定文本开头的行，按定义的分隔符拆分它们，将其内容与 excel 表进行比较，如果没有匹配，则删除该行。

我想找到最简单和最快的方法来修改这个代码，而不是删除行，添加特定的文本和前缀以及另一个文本作为后缀。

我的代码：

workbook = xlrd.open_workbook(cur_dir + '/Input_Directory/input/sample.xlsx', "rb")
sheets = workbook.sheet_names()
required_data = []
for sheet_name in sheets:
    sh = workbook.sheet_by_name(sheet_name)
    for rownum in range(sh.nrows):
        row_valaues = sh.row_values(rownum)
        required_data.append(row_valaues[2])
#print (required_data) - not in use, provides spam

basePath = os.path.dirname(os.path.abspath(__file__)) + "/Output_Directory/Output_Directory/"
outPath = os.path.dirname(os.path.abspath(__file__)) + "/Output_Directory/Output_Directory_Clean/"

for (dirpath, dirnames, filenames) in walk(basePath):
    for filename in filenames:
        filepath = basePath + filename
        outputfilepath = outPath + filename

        print("---------------------------")
        print("processing file : {}". format(filepath))
        f= open(outputfilepath,'w')

        with open(filepath) as fp:
           line = fp.readline()
           cnt = 2
           bad_cnt = 0
           while line:
               #print("Line {}: {}".format(cnt, line.strip())) - not in use, provides spam
               line = fp.readline()
               is_exist = 1

               if line.startswith("SampleText"):
                   #if not line.split("'")[1] in required_data: - not in use, provides inacurate script task
                    #    is_exist = 0 - not in use, provides inacurate script task

                   if not line.split('"')[1] in required_data:
                        is_exist = 0

                   if is_exist == 0:
                        print("Line Number {} , {}".format(cnt, line))
                        bad_cnt += 1

               if line.startswith("SampleText2"):
                   #if not line.split("'")[1] in required_data:  - not in use, provides inacurate script task
                    #    is_exist = 0 - not in use, provides inacurate script task

                   if not line.split('"')[1] in required_data:
                        is_exist = 0

                   if is_exist == 0:
                        print("Line Number {} , {}".format(cnt, line))
                        bad_cnt += 1               

               if is_exist == 1:
                   f.write(line)           

               cnt += 1
           print("found {} bad lines".format(bad_cnt))

        f.close()
        fp.close()  

    break

任何想法如何修改它？