避免I上的程序退出/

Question

我有一个Python脚本使用shutil.copy2号文件广泛的。因为我用它在网络上复制文件，所以经常出现I/O错误，导致程序执行失败：

Traceback (most recent call last):
  File "run_model.py", line 46, in <module>
    main()
  File "run_model.py", line 41, in main
    tracerconfigfile=OPT.tracerconfig)
  File "ModelRun.py", line 517, in run
    self.copy_data()
  File "ModelRun.py", line 604, in copy_ecmwf_data
    shutil.copy2(remotefilename, localfilename)
  File "/usr/lib64/python2.6/shutil.py", line 99, in copy2
    copyfile(src, dst)
  File "/usr/lib64/python2.6/shutil.py", line 54, in copyfile
    copyfileobj(fsrc, fdst)
  File "/usr/lib64/python2.6/shutil.py", line 27, in copyfileobj
    buf = fsrc.read(length)
IOError: [Errno 5] Input/output error

我怎样才能避免程序的执行中止并让它重试复制过程呢？在

我使用的代码已经通过检查文件大小来检查文件是否已完全复制：

^{pr2}$

Answer 1

你可以用

try:
    ...
except IOError as err:
    ...

抓住错误并加以处理

看看this

Answer 2

哪个块出错了？只需在其周围加上try/except：

def check_file(file, size=0):
    try:
        if not os.path.exists(file):
            return False
        if (size != 0 and os.path.getsize(file) != size):
            return False
        return True
    except IOError:
        return False # or True, whatever your default is

while (check_file(rempdg,self._ndays*130160640) is False):
    try:
        shutil.copy2(locpdg, rempdg)
    except IOError:
        pass # ignore the IOError and keep going