In my pymongo script, the insert_one function is successful but when attempting to delete a document in MongoDB using delete_one, it is not functioning.

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There could be a few reasons why the delete_one function is not functioning properly in your pymongo script. Here are some things you can try to troubleshoot the issue:

1. Check that the MongoDB connection is working properly. Make sure that you are able to connect to the database and that you have the correct credentials to perform the operation.

2. Verify that the document you are trying to delete exists in the database. You can use the find() function to search for the document and make sure it is present before attempting to delete it.

3. Double check the syntax of your deleteone command. The command should be in the format: collection.deleteone({filter}). The filter should be a dictionary that specifies the criteria for the documents to be deleted.

4. Ensure that you have the necessary permissions to perform the delete operation on the collection. Check your user roles and permissions to confirm that you have the necessary access.

5. Try running the delete_one command with a different filter to see if the issue is specific to the document you are trying to delete. If the command is successful with a different filter, there may be an issue with the specific document you are trying to delete.

6. Check the output/error messages from the delete_one command to see if there are any clues to the underlying issue. Use the traceback module or print statements to debug the issue.

If these steps do not solve the issue, you may need to provide more details or seek the help of a MongoDB or Python expert to diagnose the problem.