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#!/usr/bin/env python
from vtkmodules.vtkCommonDataModel import vtkDataObject
from vtkmodules.vtkFiltersGeneral import vtkSynchronizeTimeFilter
from vtkmodules.vtkFiltersHybrid import vtkTemporalShiftScale
from vtkmodules.vtkIOExodus import vtkExodusIIReader
from vtkmodules.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
r = vtkExodusIIReader()
r.SetFileName(VTK_DATA_ROOT + '/Data/can.ex2')
tss = vtkTemporalShiftScale()
tss.SetInputConnection(r.GetOutputPort())
tss.SetPreShift(.00000001)
st = vtkSynchronizeTimeFilter()
st.SetRelativeTolerance(.001)
assert st.GetRelativeTolerance() == .001
st.SetInputConnection(tss.GetOutputPort())
st.SetInputConnection(1, r.GetOutputPort())
st.UpdateTimeStep(0)
ds = st.GetOutput()
firstTimeStepValue = ds.GetInformation().Get(vtkDataObject.DATA_TIME_STEP())
assert firstTimeStepValue == 0.
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