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    <p>You'll probably need to show us the code that constitutes:</p> <pre><code>[do some other code here that creates a file] </code></pre> <p>The code you have works fine on my system:</p> <pre><code>import os oldmask = os.umask (022) fh1 = os.open ("qq1.junk", os.O_CREAT, 0777) fh2 = os.open ("qq2.junk", os.O_CREAT, 0022) os.umask (oldmask) os.close (fh1) os.close (fh2) </code></pre> <p>producing files as follows:</p> <pre><code>-rwxr-xr-x 1 pax pax 0 Apr 24 11:11 qq1.junk ---------- 1 pax pax 0 Apr 24 11:11 qq2.junk </code></pre> <p>You should also note the restoration of the old <code>umask</code> value which minimises the impact of changing it to the local operation.</p> <p>As you can see from the results above, you also need to be aware that the <code>umask</code> value is "subtracted" from the mode you're using to create the file and we don't know what that mode is in your particular case.</p> <p>That's evident even in your <code>bash</code> sample since a <code>umask</code> value of <code>022</code> when creating a file of mode <code>777</code> would result in <code>r-xr-xr-x</code>, not <code>rw-r--r--</code> as you have it.</p> <hr> <p>Based on your comments below where you indicate you're using <code>open</code> rather than <code>os.open</code>, a cursory glance of the Python source seems to indicate that this translates to a C <code>fopen</code> call which uses <code>0666</code> as the initial mode. This is supported by the slightly modified code:</p> <pre><code>import os oldmask = os.umask (022) fh3 = open ("qq3.junk", "w") os.umask (0) fh4 = open ("qq4.junk", "w") os.umask (oldmask) fh3.close() fh4.close() </code></pre> <p>which gives us:</p> <pre><code>-rw-r--r-- 1 pax pax 0 Apr 24 11:44 qq3.junk -rw-rw-rw- 1 pax pax 0 Apr 24 11:44 qq4.junk </code></pre> <p>So I'm not entirely certain why you're getting <code>0000</code> permissions in your case.</p> <p>It would be worth seeing what the results are when you run that above program in your environment. If it's the same as I get then the problem may well lie somewhere else.</p>
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    1. POHow to use os.umask() in Python
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    1. COI did in the bash shell, umask 0022 then did touch /tmp/test then did ls -l /tmp/test they copied and pasted the permissions directly above. I think you are confusing the differential between creating files (where execute is assumed not desired) and creating directories (where execute permissions desired is assumed).
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    2. CO@narnie, this depends _entirely_ on what code is creating the file. Obviously `touch` has different rules to, say, `ld` in terms of the mode it uses. All I was saying is that the permissions of the file depend on the `umask` value _and_ the mode, and the missing code is the bit that would tell us the mode.
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    3. COthe code I'm using to generate the file is rather complex as I'm passing file handlers around. I want the umask to be 0022 no matter what the .profile umask might be set to (mine is set to 0027). The jist is I'm just doing f = open(filename, 'w') then passing the file object on to a class that controls an overall object which has a write method that uses the f object to write out the object, returns, where f.close() is run.
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