Question

我在使用if语句时遇到语法错误。它是用一个不同的版本正常工作，但我写的输出日志，我不喜欢它如何会为它检查每个文件的输出，我一次，如果该文件存在，或不希望只写。

下面的第一个代码不起作用，它表示第三个文件是未定义的变量（代码的第五行）。

第二个代码块是它之前的工作方式。

有人知道该如何构造吗？

if any(file.endswith('.ppt') for file in os.listdir(scanDestinationPath)):
    os.startfile(machineFolderDir + machineType + '\\' +
                 partNumber + ' REV ' + revisionNumber + '\\' +
                 file, 'print')
    errorLog = open(logBookDir + 'log.txt', 'a+')
    errorLog.write('\nA setup sheet called PROG' + programNumber +
                   ' ' + partNumber + ' ' + revisionNumber +
                   '.ppt was printed.\n')
    errorLog.close()
else:
    errorLog = open(logBookDir + 'log.txt', 'a+')
    m = ('The exception occurred in printDecoSetupSheet().There does not appear '
         f'to be a .ppt setup sheet file in folder {partNumber} {revisionNumber} '
         f'under {machineType}. Moving on...\n')
    errorLog.write(m)
    errorLog.close()

第二个代码块：

    if file.endswith(".ppt"):
        os.startfile(machineFolderDir + machineType + '\\' +
                     partNumber + ' REV ' + revisionNumber + '\\' +
                     file, 'print')
        errorLog = open(logBookDir + 'log.txt', 'a+')
        errorLog.write('\nA setup sheet called PROG' + programNumber +
                       ' ' + partNumber + ' ' + revisionNumber +
                       '.ppt was printed.\n')
        errorLog.close()
    else:
        errorLog = open(logBookDir + 'log.txt', 'a+')
        m = ('The exception occurred in printDecoSetupSheet().There does not appear '
             f'to be a .ppt setup sheet file in folder {partNumber} {revisionNumber} '
             f'under {machineType}. Moving on...\n')
        errorLog.write(m)
        errorLog.close()

回溯是：

Exception has occurred: NameError name 'file' is not defined   
File "C:\Users\MacalusoC\Desktop\Technical Docs\TLC_Program_Release\Scripts\Program_Release_v4.py", line 348, in printDecoSetupSheet     
  file, 'print')   
File "C:\Users\MacalusoC\Desktop\Technical Docs\TLC_Program_Release\Scripts\Program_Release_v4.py", line 835, in main
  printDecoSetupSheet(scanDestinationPath)   
File "C:\Users\MacalusoC\Desktop\Technical Docs\TLC_Program_Release\Scripts\Program_Release_v4.py", line 869, in <module>
  main()

什么是这个if语句语法正确？

0 个答案: