this cgi script write different files, request 1 will write 1.html, 2 will write 2.html and so on. Its not updating the current file. For example create.py processes a form and write user.html file and every user is unique. so if 10 users fill up the form at the same time and click submit button, can create.py file write 10 html file simultaneously or will all the request be queued and executed one by one, because at any given point there can be several users creating this html page.
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