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Disk management utilities.
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r� t d | t | � f � � Yn X| S) z2 Convert a memory text to its value in bytes.
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No guarantee that the directory is writable.
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j t � Yq� Xq� Wqv Wd S)a� Remove all subdirectories in this path.
The directory indicated by `path` is left in place, and its subdirectories
are erased.
If onerror is set, it is called to handle the error with arguments (func,
path, exc_info) where func is os.listdir, os.remove, or os.rmdir;
path is the argument to that function that caused it to fail; and
exc_info is a tuple returned by sys.exc_info(). If onerror is None,
an exception is raised.
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