Corpus editing with file locking
Corpus readers and views are all read-only, but there will be times when you want to add to or edit the corpus files. However, modifying a corpus file while other processes are using it, such as through a corpus reader, can lead to dangerous undefined behavior. This is where file locking comes in handy.
Getting ready
You must install the lockfile library using sudo easy_install lockfile or sudo pip install lockfile. This library provides cross-platform file locking, and so will work on Windows, Unix/Linux, Mac OS X, and more. You can find detailed documentation on lockfile at http://packages.python.org/lockfile/.
How to do it...
Here are two file editing functions: append_line() and remove_line(). Both try to acquire ...
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