Track a file for changes and if file changes do something.

File_Tracker.py

import os


class FileTracker(object):
    def __init__(self, filename):
        self._cached_stamp = 0
        self.filename = filename

    def is_modified(self):
        stamp = os.stat(self.filename).st_mtime

        if stamp != self._cached_stamp:
            self._cached_stamp = stamp

            return True
        return False


def main():
    # Path of the file you're tracking
    FILE = "./path/to/file"
    print("Tracking...")

    test = FileTracker(FILE)
    while True:
        if test.is_modified():
            # File you're tracking has changed, Do something...
            pass


if __name__ == "__main__":
    main()