CODEWITHSUNDEEP
python
user5980
user5980

Reputation: 3

Python open file in write mode IOError

I'm receiving an IOError when trying to create a file using open() in python, which only seems to occur for a single filename. The directories definitely exist and permissions are granted, the loop created around 1000 files successfully. When epic = "CON" in the code below I receive the "No such file or directory" error, but it works fine for other values. 

f = open('data\\LSE\\%s.csv' % epic.strip(),'w')
f.write(u.read())
f.close()

Could this be a race issue? The files are created quite quickly.

I'm new to python so if there's something obvious I missed, apologies!

Upvotes: 0

Views: 128

Answers (1)

dsh
dsh

Reputation: 12213

The problem is that you are running this code on Windows, which still contains some legacies from MS-DOS 1.0. CON is a special name for the console device. You can't use it as a file name. The earliest versions of MS-DOS did not support directories, nor did they support the so-called "extension" of the 8.3 file naming pattern. As a result, the name is special regardless of the directory and regardless of extension.

Some references:

http://msdn.microsoft.com/en-us/library/windows/desktop/aa365247%28v=vs.85%29.aspx

Do not use the following reserved names for the name of a file:

CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9. Also avoid these names followed immediately by an extension; for example, NUL.txt is not recommended.

Upvotes: 2

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