Question

我正在编写一个名为OUT_FILE的csv文件。现在我可以看到该文件没有立即在磁盘上创建，所以我想等到文件被创建。

下面是编写csv文件的代码：

with open(OUT_FILE, 'a') as outputfile:
    with open(INTER_FILE, 'rb') as feed:
    writer = csv.writer(outputfile, delimiter=',', quotechar='"')
        reader = csv.reader(feed, delimiter=',', quotechar='"')
        for row in reader:   
            reportable_jurisdiction=row[7]
        if '|' in reportable_jurisdiction:
            row[7]="|".join(sorted(list(row[7].split('|'))))
            print " reportable Jurisdiction with comma "+reportable_jurisdiction
        else:
            print "reportable Jurisdiction if single "+reportable_jurisdiction

        writer.writerow(row)
    feed.close()
    outputfile.close()

现在我有一个名为FEED_FILE的文件，实际上是OUT_FILE的输入，即在OUT_FILE上输入数据后，OUT_FILE和FEED_FILE的大小应相同。

所以同样我写了下面的代码：

while True:
    try:
        print'sleeping for 5 seconds'
        time.sleep(5)
        outputfileSize=os.path.getsize(OUT_FILE)

        if( outputfileSize ==FeedFileSize ):
            break
    except OSError:
        print " file not created "
        continue

print " file created !!"

现在我不知道这是否正在执行，因为没有错误甚至打印没有输出？

任何帮助？

Answer 1

您可以使用python的 os 模块检查文件是否存在？

import os

def wait_for_file(path):
  timeout = 300
  while timeout:
     if os.path.exists(path):
       # check if your condition of file size having
       # same as feed file size is met
       return
     timeout = timeout - 5
     sleep(5)
 raise Exception, "File was not created"

循环直到在python中创建文件

1 个答案: