How can I get the size of a TemporaryFile in python?

Question

Currently when I write to a temporary:

import tempfile
a = tempfile.TemporaryFile()

a.write(...)

# The only way I know to get the size
a.seek(0)
len(a.read())

Is there a better way?

Not a duplicate, the other question asks about a regular file not temporary file which has no path. — Dr.Knowitall, Apr 20 '18 at 17:38
the already-answered stackoverflow thread does not have any solution related to temporary files (especially `SpooledTemporaryFile`), this post should be reopened — Han, Jul 17 '21 at 16:32

fasta · Accepted Answer · 2018-08-21T12:30:55.307

16

import tempfile
a = tempfile.TemporaryFile()
a.write('abcd')
a.tell()
# 4

a.tell() gives you the current position in the file. If you are only appending this will be accurate. If you are jumping around the file with seek, then seek to the end of the file first with: a.seek(0, 2) the second parameter "whence"=2 means the position is relative to the end of the file. https://docs.python.org/2/tutorial/inputoutput.html#methods-of-file-objects

edited Aug 21 '18 at 12:30

answered Apr 20 '18 at 06:01

fasta

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Did you mean `a.write('abcd')` ? – mkamioner Aug 20 '18 at 12:06
@mkamioner - oops - indeed. – fasta Aug 21 '18 at 12:31

score 11 · Answer 2 · answered Apr 20 '18 at 05:36

11

You can use os.stat assuming the file has either been closed or all pending writes have been flushed

os.stat(a.name).st_size

answered Apr 20 '18 at 05:36

avigil

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How can I get the size of a TemporaryFile in python?

2 Answers2