Modern Python Standard Library Cookbook

How to do it...

Like the other tempfile object, creating SpooledTemporaryFile is enough to make the temporary file available. The only additional part is to provide the maximum allowed size, max_size=, after which the content will be moved to disk:

>>> with tempfile.SpooledTemporaryFile(max_size=30) as temp:
...     for i in range(3):
...         temp.write(b'Line of text\n')
...     
...     temp.seek(0)
...     print(temp.read())
... 
b'Line of text\nLine of text\nLine of text\n'