Error if an output file already exists (matplotlib)

asked 2011-02-19 11:25:05 +0100

manifold
95 ●3 ●7 ●14

updated 2011-06-16 15:27:03 +0100

Kelvin Li
503 ●5 ●12 ●17

If I have a file already, and try to overwrite it, I get an error:

    file = __builtin__.open(filename, mode, buffering)
IOError: [Errno 13] Permission denied:

I use the matplotlib savefig function.

Full Error Output: http://rn0.ru/show/8AXiJGpriPqIQa8cdcGk/

The error only occurs if I restart the worksheet. If I manually delete all the file(s), there is no problem. How can I fix it? An easy solution would be to delete the output files before I try to overwrite them, but how can I delete files?

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I found a quick and dirty way: import os os.remove(DATA+"CSVFullOutput.csv")

manifold ( 2011-02-19 13:09:58 +0100 )edit

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answered 2011-02-19 14:52:40 +0100

benjaminfjones
2775 ●8 ●44 ●76 http://bfj7.com/

Telling the operating system to delete the files works. According to the python documentation of the builtin open method, the open mode w does the following:

'w' for only writing (an existing file with the same name will be erased)

Assuming that's what your mode is set to, I would expect this behavior, so I don't understand why you're getting the error. It's possible that the error is due to the permissions of the files you're trying to overwrite. Try deleting them manually, then use your code to create them again and inspect the permissions. Maybe your umask needs to be changed?

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Error if an output file already exists (matplotlib)

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