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usage: historyStorage = PyTablesTimeSeries(historyFilepath) # write: self.historyStorage.append(keyName, fieldName, duration, value, timestamp) # read: selection = self.historyStorage.selectTimeSlice(keyName, fieldName, duration, begin_time, end_time) currently isn't very useful because after running for two minutes or so under load (multithreaded, although i don't see why that should matter because i'm doing everything in a lock, unless PyTables is keeping a global cache itself), i keep getting errors like this (the line numbers from this project have changed since this error was captured): File "atr/pytablestimeseries.py", line 94, in _wrap kw['table'] = self._getTable(item, field, duration) File "atr/pytablestimeseries.py", line 42, in _getTable durationGroup = getattr(root, str(duration)) File "/usr/lib/python2.7/dist-packages/tables/group.py", line 826, in __getattr__ return self._f_getChild(name) File "/usr/lib/python2.7/dist-packages/tables/group.py", line 700, in _f_getChild return self._v_file._getNode(childPath) File "/usr/lib/python2.7/dist-packages/tables/file.py", line 1035, in _getNode "stale weak reference to dead node ``%s``" % nodePath AssertionError: stale weak reference to dead node ``/0`` note that line 97 of _wrap is AFTER i have closed and reopened the file! So i don't see why it isn't reset. I'm using Ubuntu package libhdf5-serial-1.8.4 version 1.8.4-patch1-2ubuntu3, and PyTables 2.3.1. other time series persistence packages for python: http://pytseries.sourceforge.net/lib.database.html some commands useful for installing: pip install decorator # http://pypi.python.org/pypi/decorator sudo aptitude install python-numexpr http://sourceforge.net/projects/pytables/files/pytables/2.3.1/ sudo dpkg -i ~root/python-tables_2.3.1-1.1_amd64.deb