IOError:[Errno 27] File too large

Steven D'Aprano steve+comp.lang.python at
Wed Mar 13 18:32:59 CET 2013

On Wed, 13 Mar 2013 09:53:17 -0700, ch.valderanis wrote:

> Hi,
> Relatively newcomer here.
> The following code fails with the above error: python version used 2.6.2
> under linux

Which part of the code fails? Please copy and paste the entire traceback, 
starting with the line "Traceback (most recent call last)" and ending 
with the complete error message.

Which file does it fail on?

> filestring='somestring'
> for files in glob.glob('*'):
> 	f2=open(files.replace('.xml','.sub'),'w') 
> 	f2.write(filestring+files)
> 	f2.close()

Some other comments:

You use the name "files" to represent a single filename, rather than 
multiple files. That is misleading, a poor choice of name.

"f2" is also a poor name.

You try to change the file extension using string.replace method. This is 
risky, and will fail if some file has ".xml" in the filename apart from 
the file extension. Worse, if you have a file *without* ".xml", your code 
will over-write that file. Better to use the os.path.splitext function 
for this.

Is filestring really a constant string like in the snippet above? Is 
there any change that it could be an enormous string?

Re-writing your code snippet:

import os
filestring = 'somestring'
for filename in glob.glob('*.xml'):
    newname = os.path.splitext(filename)[0] + '.sub'
    newfile = open(newname, 'w')
    newfile.write(filestring + filename)

> I am pretty sure that the files is less than 1kB.

"Pretty sure"? You need to be 100% certain. We can't tell you whether 
this is the case or not.

> Is there another reason for the operation to fail?

We don't know which operation has failed. That's why you need to show the 
complete traceback.


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