Permission Denied To Write To My Temporary File

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NamedTemporaryFile actually creates and opens the file for you, there’s no need for you to open it again for writing.

In fact, the Python docs state:

Whether the name can be used to open the file a second time, while the named temporary file is still open, varies across platforms (it can be so used on Unix; it cannot on Windows NT or later).

That’s why you’re getting your permission error. What you’re probably after is something like:

f = tempfile.NamedTemporaryFile(mode="w") # open file
temp = f.name                             # get name (if needed)

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