问题
Is it possible to create temporary files in python that will be deleted after some time? I checked tempfile library which generates temporary files and directories.
tempfile.TemporaryFile : This function creates tempfile which will be destroyed as soon as closed.
tempfile.NamedTemporaryFile: This function accepts a parameter delete. If delete is given the value false while calling the function the file will not be deleted on close.
What I need is a temp file which I should be able to read with its name for some time even after I close it. However, It should be deleted automatically after some time.
What is the easiest way to do this in Python 2.7?
回答1:
If you only need to run the file at intervals within your Python program, you can use it as a context manager:
def main(file_object):
# Can read and write to file_object at any time within this function
if __name__ == '__main__':
with tempfile.NamedTemporaryFile() as file_object:
main(file_object)
# Can still use file_object
# file_object is referencing a closed and deleted file here
If you need to be able to open it outside of the Python program, say after main is over, like in a process that runs asyncronously, you should probably look for a more permenant solution (e.g. allowing the user to specify the file name.)
If you really needed to have a temporary auto-deleting file, you can start a threading.Timer to delete it after some time, but make sure that your program deletes it even if it is stopped before the timer ends.
来源：https://stackoverflow.com/questions/44798879/create-temporary-file-in-python-that-will-be-deleted-automatically-after-sometim