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Editorial Team
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Asked: 2026-06-03T13:54:56+00:00

I’m writing a program in Python that stores information for every file on the

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I’m writing a program in Python that stores information for every file on the system. When it’s installed, it will walk over every file, but afterwards I want to update it whenever a new file is created, or when a file is moved. For example, In the Dropbox service, whenever I copy a file into my Dropbox dir, it immediately notices and uploads it to their server.

Is there a way to do this in Python without polling? I’m thinking about some sort of an event listener that is triggered when a file is created.

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  1. Editorial Team

    Try one of:

    I think first of them is simpler to use. Example of use (from its site):

    import watcher
w = watcher.Watcher(dir, callback)
w.flags = watcher.FILE_NOTIFY_CHANGE_FILE_NAME
w.start()

    watcher is module that wraps system API, and is described on MSDN:

    http://msdn.microsoft.com/en-us/library/aa365465(v=vs.85).aspx

    So, flag watcher.FILE_NOTIFY_CHANGE_FILE_NAME says that you will be notified about:

    Any file name change in the watched directory or subtree causes a change notification wait operation to return. Changes include renaming, creating, or deleting a file.

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