Relying on GC to close the file isn't safe. See http://stackoverflow.com/questions/1834556/does-a-file-object-automatically-close-when-its-reference-count-hits-

Relying on GC to close the file isn't safe. See http://stackoverflow.com/questions/1834556/does-a-file-object-automatically-close-when-its-reference-count-hits-zero http://stackoverflow.com/questions/1834556/does-a-file-objec...