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Asked: 2026-05-15T05:41:50+00:00

What is the best way to open a file as read/write if it exists,

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What is the best way to open a file as read/write if it exists, or if it does not, then create it and open it as read/write? From what I read, file = open('myfile.dat', 'rw') should do this, right?

It is not working for me (Python 2.6.2) and I’m wondering if it is a version problem, or not supposed to work like that or what.

The enclosing directory was writeable by user and group, not other (I’m on a Linux system… so permissions 775 in other words), and the exact error was:

IOError: no such file or directory.
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1 Answer

  1. Editorial Team

    You should use open with the w+ mode:

    file = open('myfile.dat', 'w+')
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