Check for the existence of a lock file before you open the file for writing, if it doesn't exist, create it, if it does exist, wait for it to be deleted. Python is a relatively easy-to-use language, and it offers a lot of options to the end users. What are some tools or methods I can purchase to trace a water leak? You could use that as the basis of your solution. You can create, read, write, and delete files using Python. Race condition here. Would you check the link of lsof? You could check a file, decide that it is not in use, then just before you open it another process (or thread) leaps in and grabs it (or even deletes it). Lets iterate over it and print them i.e. How do I find and restore a deleted file in a Git repository? After writing, the user is able to view the file by opening it. Find centralized, trusted content and collaborate around the technologies you use most. Notice that we are writing data/ first (the name of the folder followed by a /) and then names.txt (the name of the file with the extension). Python has a built-in module OS which can be called upon to interact with the underlying files, folders and directories. Certain operating systems may not allow you to open the file (even just in reading mode) while it is being written to, so if an error occurs relating to that, this function will return False, if this is the case you can assume the file is/was being modified. Particularly, you need the remove() function. You can do this with the write() method if you open the file with the "w" mode. This is exactly what I needed, and works as intended if you are doing a file operation, e.g scraping from the web then writing to a file and want to know when it's completed to either carry on operations or to display 'done' to the user. To learn more, see our tips on writing great answers. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you. AntDB database of AsiaInfo passed authoritative test of MIIT. If check is true, and the process exits with a non-zero exit code, a CalledProcessError exception will be raised. Unless both the new application and the legacy application need synchronized access for writing to the same file and you are willing to handle the possibility of the legacy application being denied opening of the file, do not use this method. This can be done by storing a checksum of the initial file, waiting over a predetermined polling period, then comparing the old checksum to the new one. Critical issues have been reported with the following SDK versions: com.google.android.gms:play-services-safetynet:17.0.0, Flutter Dart - get localized country name from country code, navigatorState is null when using pushNamed Navigation onGenerateRoutes of GetMaterialPage, Android Sdk manager not found- Flutter doctor error, Flutter Laravel Push Notification without using any third party like(firebase,onesignal..etc), How to change the color of ElevatedButton when entering text in TextField, Pandas dataframe to excel: AttributeError: 'list' object has no attribute 'to_excel', how to set a column to DATE format in xlsxwriter, sheet.nrows has a wrong value - python excel file. Or else it raises CalledProcessError. 1. Creating an MD5 hash of the entire file before and after a predetermined polling period can tell whether a file has been modified with a high amount of accuracy. Context Managers help you work with files and manage them by closing them automatically when a task has been completed. On Mar 7, 6:28 am, "Ros"