How to check for the Local file deletion in flask before upload


How to check for the Local file deletion in flask before upload



I am writing a web application where the user can upload the file.



Now the question is how to check whether the file exists or not before file upload.



In my case, I press the browse button in html page, select the file for upload now I delete the local file and press the upload button.
There is no response from the website it keeps on running



how to solve this.



P.S Give reason before downvoting









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