    >>> from rtree import core
    >>> del core.rt
    >>> files = ['defaultidx.dat','defaultidx.idx',
    ...          'pagesize3.dat','pagesize3.idx',
    ...          'testing.dat','testing.idx',
    ...          'custom.data','custom.index',
    ...          'streamed.idx','streamed.dat',
    ...          'gilename䔀abc.dat','gilename䔀abc.idx',
    ...          'overwriteme.idx', 'overwriteme.dat']
    >>> import os
    >>> import time
    >>> for f in files:
    ...     try:
    ...         os.remove(f)
    ...     except OSError:
    ...         time.sleep(0.1)
    ...         os.remove(f)

