Does 'a+' mode allow random access to files, on all systems?
<p>According to the <a href="http://docs.python.org/library/functions.html?highlight=open#open" rel="nofollow">documentation</a> of open function
'a' means appending, which on some Unix systems means that all writes append to the end of the file regardless of the current seek position.</p>

<p>Will 'a+' allow random writes to any position in the file on all systems?</p>
